Thermocromatic Malachite Green
Note for wet applications: Working with fine pigments (small micron size) such as this can clump in your formula. Experienced formulators will mix the pigment with a small amount of batch material in something like a mortar and pestle. Once that small batch is colored and smooth with clumps mashed out, it is then added to the larger amount of base material.
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NOT APPROVED FOR COSMETIC USE.
INCI: Polyoxymethylene Melamine, Cholesterol, Green #7
Turns green when exposed to heat.
Thermochromatic powders use liquid crystals or leuco dye technology. After absorbing a certain amount of light or heat, the crystallic or molecular structure of the pigment reversibly changes in such a way that it absorbs and emits light at a different wavelength than at lower temperatures.