HAT Stickers are stickers coated with a mixture of HAT dye and acrylic paint. In other words, Heat Activated Thermochromic Leuco dye, which changes color when warmed above room temperature, is mixed with acrylic paint.
HAT Dyes are Chromic Dyes.
Chromic Dyes are color changing substances, and like all dyes has an affinity to materials to which it is applied.
The Janice VanCleave chromic dyes are prepared with the necessary binder that helps the dyes to stick to surfaces. These dyes are all water-soluble, which means they dissolve in water.
HAT is a acronym that stands for Heat Activated Thermochromic
Heat Activated —-To activate the dyes heat must be applied. Each dye has an activation temperature, which for the Janice VanCleave HAT dyes is around 290C (850F).
Thermochromic –Thermo refers to temperature and Chromic means a color change. Thus, thermochromic is a material that changes color in response to changes in temperature.