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what harmless chemical will either congeal water, or stain the skin? (for senior pranks)?

senior prank things I've considered iodine, but i'm worried about going too far by hurting somebody allergic to alcohol

Public Comments

1. is this chemical permanent on the skin?
2. OIL WITH FOOD COLORING.IT WILL STAIN CLOTHES TOO.
3. jello there is all flavors and colors a non color jellatin called knox
4. iodine will ruin clothes tho