heat sensitive pigment

Food-contact applications change everything when you're specifying a thermochromic pigment. Standard reversible leuco dye systems often contain BPA or related compounds that make them non-starters for drinkware, food packaging, or anything that might end up near a child's mouth.

Our BPA-free food grade series delivers reversible thermochromic behavior without the regulatory red flags. These materials meet the stricter safety profiles required for lip products, nail polish, hair dye, and other direct-contact formulations where standard heat-sensitive chemistry won't clear approval.

Thermochromic pigment delivers that response through a simple thermal trigger. Touch it, warm it, cool it—the color shifts. The effect is immediate, repeatable, and requires no power source.

KTP-31-BBF is a Blue BPA Free thermochromic pigment with a 31°C activation temperature in the fine 3–10μm particle size range — a food-grade Colored-to-Colorless (C2CL) microencapsulated leuco dye pigment that is blue below 31°C and becomes colorless as temperature rises above the threshold. 

KTP-30-VB is a Purple-to-Blue thermochromic pigment with a 31°C activation temperature in the fine 3–10μm particle size range — a Colored-to-Colored (C2C) microencapsulated leuco dye pigment that transitions from purple below 31°C to blue above 31°C in response to body temperature or warm contact. 

KTP-30-BR is a Black-to-Red color-changing thermochromic pigment with a 31°C activation temperature in the fine 3–10μm particle size range — a microencapsulated leuco dye pigment that shifts from black below 31°C to red above 31°C, producing a two-color visual transition triggered by body temperature or warm contact. 

KTP-18-BY is a Yellow thermochromic pigment with an activation temperature of 18°C, in the fine 1–10μm particle size range — a microencapsulated leuco dye pigment that is yellow below 18°C and becomes colorless as temperature rises above the threshold. 

KTP-16-BR is a Red thermochromic pigment with an activation temperature of 16°C, in the fine 1–10μm particle size range — a leuco dye-based color-changing pigment that is red below 16°C and becomes colorless as temperature rises above the activation threshold.