The voice of Frida Kahlo? How Researchers Check the Authenticity of Sound Documents | Art | '

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The news had caused a stir worldwide and at least in Mexico for great euphoria – despite all uncertainties. In the archive, which the radio station Televisa had donated to the national phonology library for digitization and evaluation, the experts discovered a tape recording to which Frida Kahlo was to be heard. "Frida's voice has always been a big mystery, an endless search," said director of the phono library, Pável Granados. Mexico's Minister of Culture Alejandra Frausto also emphasized the historical significance of the find: So far there has been no admission of Kahlo.

Frida Kahlo recording is from the 1950s

The recording probably comes from a 1955 broadcast pilot show and should have been recorded in 1953 or 1954. The program contained a short biography of the painter Diego Rivera, with whom Kahlo was married twice. A woman's voice reads from her essay "Portrait about Diego", which appeared in a 1949 exhibition catalog.

The most famous painter in Latin America could have spoken this recording herself. In the almost two-minute excerpt she speaks very quickly, lovingly describes the woman her husband as "a big kid, immensely, with a friendly face and sad look."

But despite all the euphoria also limited the phon sound in her tweet on the alleged discovery of the voice Frida Kahlos cautious that the excerpt was "probably read by her", but that was not yet clear.

Profiling like a ransom call

According to the possibly great historical significance, the recordings are now subjected to a test in order to finally verify the genuineness. The safer the result should be, the more time-consuming the procedure becomes, which is similar to a criminalistic way of working. In the beginning, profiling the voice, comparable to the process of a ransom call, says Martin Steinebach, Head of Media Security and IT Forensics at the Fraunhofer Institute for Secure Information Technology. He and his team have checked for the "mirror" and the "Süddeutsche Zeitung" the authenticity of the so-called Ibiza video, the publication of which had the break of the government in Austria.

Every detail is being analyzed

"The first step is to assess whether the voice matches the given source," explains Steinebach. "There's biographical information about Frida Kahlo: where did she grow up, who were the parents?" Does the voice fit in with a woman of this age growing up in this region? There may be a regional accent, and one compares whether to use the words are typical of the milieu. "

The whole process of verification involves a number of specialists in different fields, and the technical analysis is only performed in the second step. If Martin Steinebach got comparable material to test, it would first be digitized in order to be able to follow up on possible tracks: "With which device was recorded, which year did the device come from? Recordings can have characteristic fluctuations, which is why it is checked whether the behavior of the Tape reel fits the devices of the times. "

Museum visitor points to a self-portrait by Frida Kahlo (picture-alliance / dpa / V. Sharifulin)

Frida Kahlo has left numerous pictures, but a sound recording was not yet known

Since the recording should come from the 1950s, reference devices would have to be requested from collectors or archives in order to make their own recordings and to be able to compare their fluctuation behavior with the behavior of the material to be examined. "We call it ballistics, the term is used when assigning a bullet to a weapon, and the combination of device and medium is the first step."

Problem: There is no second source

Sascha Zmudzinski, who is responsible for cybersecurity and media analysis training at the Fraunhofer Institute, also points to the substrate: "The tapes have multiple magnetic layers." Was the manufacturing process common then, was this medium available in that location? " If one can find out where the radio stations bought their material at that time, the manufacturers could possibly help with information. Zmudzinski draws a comparison to the Hitler diaries whose falsification was stolen because of the material used: In a test under ultraviolet light brighteners were detected at that time, which had been used in papermaking only since the 1950s.

While there is often a reference in historical documents-another recording or other image that can be used to make comparisons and deduce similarities or differences-the sound source on which Frida Kahlo is said to be unique. The phonotheque hopes that there are more recordings of the painter in the archive of the radio station, but there is currently no second source.

Absolute safety will not exist

Therefore, even after a thorough examination of the material, you will not be able to make a complete statement about whether it really is Frida Kahlo, says Martin Steinebach. "But it is not impossible to check without reference whether the speech and the voice fit the given person." Frida Kahlo is a special case because of her illnesses.

Painting by Frida Kahlo shows a double portrait of the artist (picture-alliance)

Lifelong pain: Frida Kahlo

At the age of six, the artist was suffering from polio. When she was 18, a steel pole in a bus accident pierced her abdomen, "like the sword the bull," as Kahlo himself called it. This was followed by more than 30 operations in as many years. Often she had to lie in bed for weeks, trapped in a steel corset or a full body plaster. "What effect does it have on the voice if someone suffers from polio and has long worn a steel corset?" Asks Sascha Zmudzinski. These limitations could lead to conclusions about the speech behavior. "A medical forensic scientist could estimate whether the voice, the way in which speech is spoken and air is drawn, fit the appropriate person," adds Martin Steinebach.

A lot of work for the examiners

There is a lot of diligence in front of the experts in Mexico. Even the consequential verification of the Ibiza video was easier, because the scientists not only audio, but also video material was available, explains Steinebach: "The more data and reference material available, the more resilient in the end, the forensic statement."

Frida Kahlo, who became popular with folk painting in the styles Surrealism and New Objectivity, is today a myth – also because she fought her way into the male domain of painting. To the Russian revolutionary and communist Leon Trotsky, with whom she had an affair, Kahlo gave a house in which Trotsky hid. Throughout her life she suffered from the pain she used in her paintings, 55 of her 143 works are self-portraits. The last few years Frida Kahlo spent in a wheelchair, in 1954 she died at the age of 47 years.

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