Black Thermochromic Pigment Turn Colorless at 25°C / 77°F

Black thermochromic pigment that turns colorless at 77 Fahrenheit or by the human touch. Color changing pigments can be used for print, plastic or paint.
Thermochromic black powder has a reactivity point of 25°C / 77°F with a very fine and fluffy consistency. In temperatures cooler than the reactivity point it is a pastel black/gray powder which looks similar to soot or ash. This color is not UV reactive the way some other pigments are and will yield no effect under a black light. It reaches its colorless state in temperatures higher than the reactivity point. In its colorless state it is an off-white powder, which can appear transparent in lower ratios or thin layers. 

Thermochromic Pigment - Black - 10g : ID 4134 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits

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