This claim is not proven but is most likely true. Looking at the original source tagged from Bluesky, Popular Science Magazine, establishes credibility because the magazine itself has been reporting on science and technology featuring articles of the likes of Charles Darwin since its founding in 1872. Additionally, the author Lauren Leffer, is a “science, health, tech, and environmental journalist based in Baltimore, MD” and has published material in National Geographic, and Scientific American (Leffer). Furthermore, the article is relevant, being published on September 4th, 2024.
Within the context of the article, it does examine how tartrazine could be potentially harmful for an animal but needs more testing. They also discuss how Yellow 5 is used for human medical purposes and could allude to possible testing with humans in the far future (Leffer 2024).
Looking at the original study titled “Achieving optical transparency in live animals with absorbing molecules” conducted by Guosong Hong and colleagues, the claim is backed up by a peer-reviewed and well-established (founded in 1880) source for professional science studies, Science magazine (Science Magazine). In addition, it was conducted by Stanford's Department of Materials Science and Engineering furthering high credibility because they have been accredited as a long-standing top biological research university.
The “most likely” portion is because only one major study has been conducted for this claim, so there’s less diversity in confirmation and data. In addition, the claim is labeled as a “theory” and has not been proven true. Within the article published, it states “Following our theory, we found that an aqueous solution of a common food color approved by the US Food and Drug Administration, tartrazine, has the effect of reversibly making the skin, muscle, and connective tissues transparent in live rodents” (Ou et al. 2024).
While the article states that the common chemical can dye rodent skin, the study’s focus is the discovery of optical transparency of animals and how it can be used to help analyze and understand animalistic structures or “visualize the structure, activity, and functions of deep-seated tissues and organs without the need for surgical removal or the replacement of overlying tissues with transparent windows”(Ou et al. 2024)
It’s important to recognize the claim is carefully picked out to scare or cause fear about American health (food) when in fact the study is not prioritizing that. Its main concern is how to utilize tartrazine to advance medical procedures or study how animals work.
Sources
https://www.science.org/content/page/about-science-aaas
https://www.science.org/doi/10.1126/science.adm6869
https://laurenleffer.com/
https://www.popsci.com/science/dye-mice-transparent/