“As soon as we took the frame off, we saw a gray-white water-soluble paint that preserves the painting beneath it,” Ms. Pozeluyeva said.

The company’s brand, called AvoColor, has already tested the stable, water-soluble coloring in soda, ice cream and gummy bears.

And you don’t have to worry about overdoing it, because B12 is water-soluble — so your body takes what it needs and flushes out the rest.