Add 2 to 3 drops of food coloring to the solution. (If you want to give your foam stripes, put the drops on the edge of the bottle’s mouth, but do not mix them in.) ...

Researchers used a food coloring dye used in Doritos, seen here on the shelves at No Good Candy Thursday, May 27, 2021, in St. Cloud, Minnesota, to create mice with see-through skin.

In mere minutes, smearing mice with a common food dye can make their skin almost as transparent as glass. For a study in Science, researchers spread a solution of tartrazine, a common coloring for ...