heat reactive dye

A batch of injection-molded cups comes off the line. They're bright red at room temperature. Pour hot coffee in, and they turn transparent, revealing a printed message underneath. That's not a coating trick or a printed effect—that's thermochromic pigment responding to a physical st...

A garment that changes color when the wearer's body heat rises. A sports jersey that signals overheating in training. A children's fabric that reacts to warm water. These aren't novelty concepts anymore — they're live briefs hitting R&D desks with increasing regularity, and the chemistry b...