In the future, if you want to dye something for use as a bath or foot soak, I'd suggest using a bath safe mica powder dispersed in a small amount of oil instead of food coloring. Only because food coloring can stain your bath or dye your skin.
FYI, with Epsom salt in it then it shouldn’t be consumed. Unless you wanna be on the toilet for 24 hours. When we used to make moonshine we put it in our mash so if anyone drank it while we weren’t watching they wouldn’t drink much lol. After distilling it’s fine but unrefined it’s awful haha. 😂😂😂😂