Food Dye Yellow No. 5
Makes mice skin see through
The food dye, Yellow No 5, has been shown to make mice skin see through1. Yellow No 5, also known as tartrazine, or "E102", is found in confectionery, cotton candy, soft drinks, instant puddings, flavored chip: Doritos, cereals: corn flakes, muesli, pastries, soups, ice cream, ice pops and popsicles, confectionery and hard candy, such as gummy bears, marshmallows, pickles, and much more2.
1
https://pubmed.ncbi.nlm.nih.gov/39236186/
2
https://www.atamanchemicals.com/e-102-tartrazine_u27824/