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Gold, alchemists, nanospheres: How the mystery of the Alhambra’s purple stains was solved | Culture

Some parts of the Alhambra, the world-famous medieval Islamic monument in Granada (southern Spain), feature purplish smudges. And nobody has ever been sure exactly why, nor what caused them, or by what process they came to be there. But now two scientists from the University of Granada, Carolina Cardell and Isabel Guerra, have untangled the mystery. Their investigation, which has been published in Science Advances, has all the ingredients of a good detective novel: an apparently unfathomable mystery in which the protagonist is gold, an accidental discovery in a Florence library, and the presence of a 17th-century alchemist, Cassius, at the story’s every turn. And behind it all there was science. A lot of it.

It all began in the 1990s. “We identified purple stains at the Alhambra that weren’t due to any added pigment, and we didn’t know what had caused them. So we decided to investigate,” says Cardell, a professor at the department of Mineralogy and Petrology at the University of Granada. “Shortly afterwards we went to a conference in Florence and spent an afternoon in a library. And there the penny dropped because we found information on what we needed to look for: the purple color could have been caused by particles of gold.”

Seeking out these gold particles was not difficult. Guerra, head of the scientific instrumentation center at the University of Granada, is an expert in electron microscopy and she used that expertise to trace the gold particles in the purple stains. “There they were. I call them stars because gold shines very brightly under the microscope. I remember that day perfectly, I’ll never forget it.” The scientists had made a huge step forward in their work: they now knew that the purple stains at the Alhambra were caused by gold particles. But in science that doesn’t count for much. What was important was to discover by what process the particles had been produced.

“Gold is a very noble material, it cannot be altered, that is precisely what gives it such great value,” says Guerra. And yet, however, something had altered the gold at the Alhambra. “We thought about going public with the information that the stains were particles of gold, but that we did not know how they had formed. At the end of the day, the Alhambra is hundreds of years old and it was very difficult to pinpoint the explanation. But we are both very stubborn, very tenacious, and so we kept on investigating.”

A detail of the plasterwork at the Alhambra, showing blue and purple smudges.
A detail of the plasterwork at the Alhambra, showing blue and purple smudges.UGR

The purple stains of the Alhambra are not everywhere, only in some of the gilded portions of the monument that are outdoors or exposed to humidity. And then again, not on all the golden surfaces in those areas. “The type of gilding in which we found the stains is the one in which a very thin sheet of gold was applied to a sheet of tin,” explains Cardell. “In other words, the starting point is a bimetallic structure. It was done this way because the gold leaf was very thin, about 2 microns thick [a millimeter is a thousand microns, a hair is 150 microns] and the tin foil gives the gold more shine and improves handling.”

There is another fact that is also key in this story: Granada sits 50 kilometers in a straight line from the Mediterranean, exposing it to salt from the sea spray. “And that means that the Alhambra is exposed to marine aerosols that contain chlorides,” says Carolina Cardell. The researchers discovered that, due to humidity, the tin sheets had oxidized and the by-products of this oxidation had begun to come out through the pores and fissures of the gold sheets and had partially covered the noble metal. They had taken another step, but not the definitive one because neither of these compounds can alter gold to form the particles that cause the purple stains.

“What happened”, continues Isabel Guerra, “is that these by-products did not completely cover the gold sheets; there were areas that were covered and others that were not.” And that meant that there were areas of the sheets that were still exposed to oxygen and others that had ceased to be so because they were covered. This fact caused the formation of some electrochemical microcells, which they call “differential aeration nanocells”, because some are exposed to oxygen and others are not, “and these nanocells can dissolve gold”, concludes Guerra.

The two researchers had always had in mind what is known as Cassius purple. “Gold particles are widely used in microbiology,” says Isabel Guerra. “For example, the first pregnancy tests used them and that’s why the result looked pink.” There is a great industrial technology dedicated to producing gold nanoparticles and its historical antecedent is the work of a medieval alchemist named Cassius. He discovered that gold only dissolves if you add hydrochloric and nitric acid to it and then it forms a yellowish solution. “If you add tin oxide to that yellowish solution, you have a purple precipitate made up of tiny gold particles, known as Cassius purple, which was a highly coveted pigment in the Middle Ages,” she adds.

When Isabel Guerra and Carolina Cardell reached that point, they already had it all: they had found the explanation for the purple stains in the Alhambra, which are due to a mixture of elements: the tin sheets behind the gold leaf, the humidity of the environment and the aerosols that the wind brings from the Mediterranean, which dissolved the gold in the sheets. “Gold nanospheres are one color or another depending on their size,” explains Cardell. “The 30-nanometer ones are reddish in color and as their size increases they acquire shades that go from light blue to purple or brown. Most of the ones in the Alhambra are 70 nanometers, and that’s why they’re purple.”

The discovery that the purple stains of the Alhambra are nothing more than dissolved gold has practical applications, as Carolina Cardell explains: “On the one hand, it has advanced basic research on gold alteration processes, but it also provides clues so that conservators and restorers can choose the most advanced intervention methodologies. The different heads of conservation of the Alhambra are enthusiastic about the information that we have given them”. And adds Isabel Guerra: “Once we have trained our eyes to see those bruises, we have observed that they are in many other places. For example, we have seen them in a monument in Toledo and in another in Seville.”

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‘Women Dressing Women’: The Metropolitan Museum of Art’s tribute to a century of great female designers | Culture

The Costume Institute’s fall exhibit at New York’s Metropolitan Museum of Art (Met) pays homage to female creation. Women Dressing Women is a statement of intent that starts with the exhibit’s very first panel. Women designers, artisans and artists have covered the female universe with their designs and different visions of women, always making them protagonists, sometimes turning them into objects but never passive subjects when it comes to clothing. Over 80 outfits from the Institute’s permanent collection are on display, and the exhibit covers the fashion industry chronologically, artistically and commercially. The pieces represent the fashion industry’s two main centers, Paris and New York, including names and labels that connect haute couture and street fashion, and the most refined traditions of the Old Continent, American avant-garde and utilitarianism.

The exhibition, which opens on Thursday and will remain on display through March 3, 2024, starts with a selection of black and white photographs, projected in a loop, showing the work of dressmakers, tailors and seamstresses at anonymous workshops between 1907 and 1962. There are also images of the first timid tests for a client and the first private fashion shows in salons at a time when designers didn’t have name recognition, let alone the planetary fame that they have acquired in recent decades (to say nothing of the attention they’ve received in recent years from celebrations like the great annual fashion exhibit at the Met and the museum’s fashion gala, the event of the spring).

This black and white tribute features the precursors of over 70 women designers, who bring dreams to life with their needles and thimbles. The exhibit traces the lineage of the last century’s most influential women-led fashion houses (although only a couple of them remain today, the House of Dior and the House of Chanel). It features the work of pioneers like Adèle Henriette Nigrin de Fortuny and her Venetian textiles; the exquisite Madeleine Vionnet; Spanish designer Ana de Pombo, one of the last at the French fashion house Paquin (1891-1956); and Elsa Schiaparelli, who led her own brand and was perhaps the first designer with name recognition. Indeed, the latter had an exhibition at the Met dedicated to her in 2012, in which she engaged in an imaginary dialogue with her famous compatriot, Miuccia Prada. Big names (Chanel, the aforementioned Miuccia Prada, Marchesa, Rodarte) do appear in the exhibit, but it highlights unknown women and those time has forgotten, as in the selection of ethereal creations from the first decades of the 20th century.

Vista general de la sala principal de 'Women dressing women', la exposición de otoño del Instituto del Traje en el Met.
A panoramic view of the main room of the ‘Women Dressing Women’ exhibition at the Met in New York. The Metropolitan Museum of Art

The figure of the designer known by name was forged in the workshops where seamstresses, milliners, apprentices and tailors toiled for decades. As an introductory panel accompanying a selection of anonymous photographs notes, “in the centers of French and European fashion, women’s right to dress other women was a slowly won privilege,” since men dominated the industry. It took a long time for female professionals to gain a foothold, something that happened with the deregulation of the guilds. In the United States, however, this vocation was seen as a natural, industrious extension of domestic responsibilities: after all, sewing was an inherently female occupation.

'Women dressing women' (Met, Nueva York)
One of the rooms of ‘Women Dressing Women,’ the fall fashion exhibit at the Metropolitan Museum of Art in New York. The Metropolitan Museum of Art

At the press preview of the exhibit on Monday, Max Hollein, the director of the Met, explained that fashion created by women has helped empower women, as well as the designers themselves. “This exhibition invites reflection on the vital contribution women have made to fashion from the early 20th century to the present by amplifying historically undervalued voices and celebrating the celebrity they have achieved. The garments on display exemplify the countless women whose contributions were, and continue to be, the lifeblood of the global fashion industry as we know it today.”

Vestíbulo de 'Women dressing women', la exposición de otoño de moda del Met.
The foyer of the ‘Women Dressing Women’ exhibit, which features designs by Madeleine Vionnet, Elsa Schiaparelli and Gabrielle Chanel, among others. The Metropolitan Museum of Art

Andrew Bolton, the world’s most influential fashion curator, senior curator at the Costume Institute and the righthand man of Anna Wintour (the all-powerful fashion Vogue editor and architect of the Met fashion gala), also spoke at the press preview of the exhibit. He noted that “women have been central to the success of the Costume Institute since its inception. Its founders include several inspiring women; that’s why the Institute remains dedicated to celebrating women’s artistic, technical and social achievements. They are part of fashion history.”

Vestido de noche de Mad Carpentier, de los años cuarenta.
An Mad Carpentier evening gown from the late 1940s, which is on display at the Met through next March. Anna-Marie Kellen © The Metropolitan Museum of Art

For Mellissa Huber, associate curator at the Costume Institute, the fall exhibition offers an opportunity to “learn the crucial stories of groundbreaking women designers who played a pivotal role in the conception of fashion as we know it. Women’s contributions to fashion cannot be quantified, but our intention with this show is to celebrate the Costume Institute’s permanent collection, which represents the rich history of Western fashion.” As Hollein emphasized, fashion is a symbol of female power and emancipation but also the result of tremendous collective work. Historically, conceptually and commercially, fashion is also the triumph of social progress, a powerful vehicle for women’s social, financial and creative autonomy. As Ted Pick, the co-chairman of Morgan Stanley, a sponsor of the exhibit’s luxurious catalog, points out, “the milestone that three Parisian haute couture fashion houses—Chanel, Dior and Iris van Herpen—are run today by powerful women” cannot be overlooked.

One of the rooms in the Met's fall exhibition, with designs by Ester Manas, Balthazaar Delpierre, Purchase, Millia Davenport, Adèle Henriette or Elisabeth Nigrin Fortuny.
One of the rooms in the Met’s fall exhibition, with designs by Ester Manas, Balthazaar Delpierre, Purchase, Millia Davenport, Adèle Henriette or Elisabeth Nigrin Fortuny. The Metropolitan Museum of Art

“The common thread that connects different generations of professional women reveals how subsequent generations have built on and expanded the legacy of their predecessors. The exhibit reflects the intergenerational dialogue between these designers in historical perspective and the talented women who worked with them from a contemporary point of view,” explains Karen Van Godtsenhoven, a co-curator of the exhibition. Indeed, to cite just one example of these silent conversations between the pieces on display, there is the direct thread between Fortuny’s characteristic pleating and Comme des Garçons’ textile origami; the austere scenography makes the connection stand out and reveals the continuum mentioned by the experts who organized the show. There’s a similar connection between Vivienne Westwood’s conceptual punk and the groundbreaking dress with pieces of metal inserted in silk with which the house Vionnet reinterpreted the syntax of ancient Greek ceramic painting in 1924: tradition as modernity and vice versa, along with the eternal aspect of fashion and art.

Indeed, to see one example of this legacy, look at the heads of the mannequins wearing the dresses in the pioneers’ room (the first room in the exhibit): they are topped with the enduring forms of classical Greek columns.

'Theodosia' (ca. 1925), túnica de Maria Monaci Gallenga para su casa de moda, Gallenga.
‘Theodosia’ (ca. 1925), a tunic by Maria Monaci Gallenga for her fashion house, Gallenga. Anna-Marie Kellen © The Metropolitan Museum of Art

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Rich, Influential And Poorly Dressed: Powerful Men Have A New Uniform

One of the best memes of this year is undoubtedly the photo of Justin Bieber turned into a caricature of himself, wearing yellow Crocs and tracksuit bottoms combined with a sweatshirt and a pink Nahmias cap. And next to him is his wife, Hailey Bieber, looking flawless in an impeccable red strapless Ermanno Scervino mini dress.

Justin Bieber
Justin Bieber and Hailey Bieber in New York in August 2023. Gotham (GC Images)

In the image, Justin Bieber is the personification of the scumbro trend, defined by Vanity Fair columnist Kenzie Bryant, who put together the words “scum” and “bro.” This trend defines the aesthetics of celebrities such as Pete Davidson, Tom Holland and Machine Gun Kelly. What defines this hectic style is an absolute lack of aesthetic coherence; they want us to know that they walked out of their houses wearing the first thing they saw in their closets. What is often striking (and incomprehensible) is that scumbros usually have a partner (like Hailey Bieber) who looks exactly the opposite; their outfits are neat, stylish.

“The strategy, in the end, is that celebrity couples dress alike, something that is accentuated when there are brands involved,” Leticia García, chief fashion editor of the fashion magazine SModa, says. “Everything is marketing, and the construction of the celebrity image is nothing more than advertising. The next step is the construction of the image of the couple, something that seems to me to be a way of stripping people of [their] self-identity.”

Looking disheveled on purpose

Going out looking messy and untidy — compared to one’s partner — is a strategy to attract attention, according to Pedro Mansilla, a sociologist, journalist and fashion critic. This is particularly true when we talk about celebrity couples, Mansilla adds. Famous men tend to do it when they are dating “women who have achieved notoriety on their own merits.”

Pete Davidson
Pete Davidson dressed to go to a premiere in 2022. Jamie McCarthy (Getty Images)

Mansilla points out that this happens primarily in heterosexual couples and adds that it could be due to the so-called bad boy attraction, with his characteristic sins: carelessness, unpunctuality, laziness, etc. There is nothing more attractive than a guy who — due to his status, and thus, power — can dress whichever way he wants, says Mansilla. In other words, according to this new trend (very ad hoc with the Silicon Valley power players who went from nerds to billionaires at the beginning of this century), for a powerful man, nothing is more exciting and vindicating than to dress as if he were powerless.

This style is, in fact, the result of an aesthetic decision. Actor Adam Sandler considers himself, perhaps, the last great purist of the scumbro style, someone who dresses this way out of sheer carelessness. When asked in an interview how he would define his aesthetic, he replied: “A man who opened a suitcase and threw something on.” The difference between Sandler and others — such as Justin Bieber or Pete Davidson — is that he is probably the only one who dresses this way in the most natural way possible. Nowadays, scumbros wear streetstyle brands such as Palace and Supreme, as well as clothing from big brands l Gucci, Versace, and Prada. Their style is more about being perfectly imperfect.

Adam Sandler
Adam Sandler well-dressed for the release of his own movie in 2022. Dia Dipasupil (Getty Images)

Proof that whoever dresses like this does not do it out of laziness, but with absolute intention, is that when a user wrote on X (formerly Twitter) that Diplo was starting to “look like a dude that sells you bad weed on the Venice boardwalk,” the musician posted a screenshot of the tweet on his Instagram profile along with the caption “Goals achieved.” Even Esquire magazine published an article in which it pointed out that celebrities dress “like teenage weed dealers.”

Brands like Balenciaga and Acne Studio have seized on this supposedly chaotic aesthetic. And, as Kyle Dinkjian — who runs the Instagram account JonahFits, which analyzes Jonah Hill’s looks — explained to The Wall Street Journal, this style inspires men who “don’t look like movie stars to get into their own fashion and make it their own.”

“People are tired of the ‘everything goes’” mentality, Pedro Mansilla counters. “Uglysm still dominates, but the sartorial order will prevail at some point. The anti-establishment style is showing signs of fatigue. The dandy is starting to come out of the closet,” he adds.

A new type of narcissist

But do these men really not care about their style at all? “When someone claims that fashion is banal and superfluous, it’s a sure sign that they are a person who thinks they are above the rest,” says García. “People dress not only as a way of expressing themselves, but also out of respect for others.” We must differentiate here, however, between two types of scumbros. One of them is Justin Bieber, who knows about fashion, has been nourished by it and has collaborated, in fact, with big brands such as Calvin Klein. His scumbro style is actually worth thousands of dollars. On the opposite side of the spectrum is something like Adam Sandler, who many Internet users defend for being someone who dresses according to his comfort and his own style. He is true to himself. Authentic.

Pete Davidson
Pete Davidson dressed to go on television in 2021.NBC (NBCU Photo Bank via Getty Images)

“A trained eye should always distinguish those who don’t care how they are dressed from those who do care, but pretend they don’t,” Mansilla explains. “These are the most interesting because, in principle, they set the upward trend. We have become so bored with seeing the integrated that we wish to see the apocalyptic, to use Umberto Eco’s terminology.”

It seems that stylistic laziness is less and less about laziness and more and more about strategy, especially when a closer look at their closets reveals that every garment and accessory is worth hundreds or thousands of dollars. If silent luxury has taught us that even the most basic white T-shirt can be a sign of social status, styles like scumbro are not precisely symptoms of passivity, but of careful decisions. Today’s narcissist has mutated: he is no longer just Christian Bale in American Psycho, he has also been spotted wearing sweatpants, a Hawaiian shirt and Crocs.


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How News Helicopters Ushered A Fresh Television Genre In Los Angeles

By Darren Wilson


Fifteen minutes of fame was not enough for Johnny Anchondo. Local television devoted some 100 minutes of live coverage to this repeat offender, following one of the wildest chases Los Angeles has seen in recent years. In that time, the 33-year-old criminal ran a stop sign and caused an immense mobilization of the police as he stole two pickup trucks, rammed into dozens of vehicles at high speed and escaped from at least 15 patrol cars that were hot on his trail for some 12 miles. All of this was recorded by the all-seeing eye in the sky, news helicopters.

“Chases are the best. They are dynamic, they move fast. Things can change in an instant. Sometimes they seem endless from up there,” says Stu Mundel, one of the journalists who have been following events on the city streets from a helicopter for decades. “And I say this from the bottom of my heart, it’s genuine, but I always wish things would end well,” he adds.


News Helicopters Ushered A Fresh Television Genre In Los Angeles


In Los Angeles, chases are now a television genre in their own right. Journalists like Mundel fly for hours over a gigantic urban sprawl of 88 cities with 11 million people. From way up high, they report on traffic, crashes, shootings and fires in the metropolitan area. But few events arouse the audience’s interest as much as the chases through the city’s vast thoroughfares. The police chase starring Anchondo attests to that fact; the video has over 28 million views on YouTube.

The genre was born in this city. The idea came to John Silva, an engineer for a local television station, while he was driving his car on a freeway near Hollywood. “How can we beat the competition?” he wondered. The answer came to him behind the wheel. “If we could build a mobile news unit in a helicopter, we could beat them in arriving to the scene, avoiding traffic and getting all the stories before the competition,” Silva told the Television Academy in a 2002 interview.

In July 1958, a Bell 47G-2 helicopter made the first test trip for the KTLA network, becoming the first of its kind anywhere in the world. By September of that year, Silva’s creation, known as the Telecopter, already had a special segment on the channel’s news program. Before long, every major television network had one. Silva died in 2012, but his invention transformed television forever.

The chase genre’s crowning moment came in June 1994, when the Los Angeles police chase of a white Ford Bronco was broadcast live on television. In the back of the vehicle was O.J. Simpson, the former football star, whom the authorities had named the prime suspect in the murder of his ex-wife and her friend. Bob Tur (now known as Zoey Tur after a sex change operation), the pilot of a CBS helicopter, located the van on the 405 freeway being followed by dozens of patrol cars. Within minutes, there were so many helicopters following the convoy that Tur found the scene worthy of Apocalypse Now. The audience was such that TV stations interrupted the broadcast of Game 5 of the NBA Finals to follow the chase, which lasted two hours.

Motorists wave to ex-football star O.J. Simpson as he flees from the police in the back of a white Ford Bronco pickup truck driven by Al Cowlings in Los Angeles, California, in June 1994.

Motorists wave to ex-football star O.J. Simpson as he flees from the police in the back of a white Ford Bronco pickup truck driven by Al Cowlings in Los Angeles, California, in June 1994. Jean-Marc Giboux (Getty Images)

“It’s a very interesting thing. It may sound morbid, but it’s not. People follow [police chases] because they are like a movie, we want to know how it will end and how the story unfolds: will good triumph over evil? Or will this person manage to escape? We journalists are objective, but the adrenaline and excitement is genuine,” says Mundel. In his years of experience, he has seen how technology has evolved. In the 1990s, people used a paper map as a guide. Today, viewers can see a map superimposed on the images Mundel captures with his camera.

Four out of 10 chases are initiated after a vehicle is stolen. The second most common reason for them are hit-and-runs by drivers who are drunk or under the influence of drugs. According to the Los Angeles Police Department, most fugitives are hiding a more serious crime: homicide, rape or violent robbery. In 1998, only four out of the 350-plus drivers arrested after a chase were let off with only a traffic ticket; five hundred chases were recorded that year.

A growing phenomenon

In 2022, 971 chases were recorded. On average, chases last about 5.34 minutes and cover about five miles, although the vast majority (72%) end within five minutes and do not travel more than two miles. 35% of documented chases ended in crashes with injuries or fatalities in 2022. That figure represents a slight decrease from 990 in 2021. In 2019, there were fewer: 651 chases and 260 crashes.

A few decades ago, authorities tried to reassure Angelenos by claiming that a person had a one in four million chance of accidentally being killed in a police chase of a criminal. “There’s a better chance of being struck by lightning,” the police department estimated. But things have changed. An official report presented in April indicates that, over the past five years, 25% of chases have left people dead or injured. That almost always includes the suspect, but the number of innocent people who have been hurt has also increased.


News Helicopters Ushered A Fresh Television Genre In Los Angeles

News Helicopters Ushered A Fresh Television Genre In Los Angeles


Although there is plenty of material on the street, uncertain times for local journalism have limited coverage. Univision and Telemundo have dispensed with their helicopters in Los Angeles. Fox and CBS have joined forces and are using one aircraft instead of two. For the time being, KTLA, which invented the genre, remains committed to having a helicopter in the air.

The days may be numbered for these televised events. Some metro police departments have asked their officers to stop chasing criminals at high speed for the safety of the public. Instead, they have employed technology with high-definition cameras and drones to chase criminals, as has happened in cities like Dallas, Philadelphia and Phoenix.

The Los Angeles police have said that they are studying the implementation of the Star Chase system in some of their vehicles. Star Chase features a launcher that triggers a GPS transmitter, tagging a fleeing vehicle and allowing the authorities to track the position of the person who has escaped in real time. Another measure under consideration is the use of an industrial-strength nylon net that traps the rear axle of the fleeing car. All of this could yield dramatic footage for the eye in the sky.


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