Thermochromic
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Thermochronic
Thermochromic inks or pigments change state in the presence of heart. Once they reach temperature, the inks become colorless Pigments can be mixed with different substrates like paint, glue, resin, Polymorph, Sugru, etc.
Thermochromic pigments start to vanish at 29°C by the time it reaches 31°C it turns translucent, returning to normal when the temperature reduces.
https://www.youtube.com/watch?v=q_LFXGXZvUk&feature=emb_title
