Temperature Activated Color Changing Thermochromic Powder Pigment BLUE changing to VIOLET at 72F22C Ideal for Color Changing Slime Hair Resin Jewelry Arts Crafts School Home Projects Science Experiments DIY Color Changing Nail Polish TShirts Shoes Tumblers Original Paintings The process is reversible when it gets cold the pigment turns to its original color It can be used again and again NONTOXIC pigments safe to use on skin and color changing by body temperature Product of USA