sugar / sugar

Principle

The reason that human figure on mug puts on and takes off clothes is because the clothes is spread with a reversible thermochromic material. Color disappears when temperature rises and emerges when it drops. The color changes due to rise and fall of temperature.

Thermochromic material is a microcapsule whose color varies with rise and fall of temperature. Microcapsule wraps temperature sensitive colorless pigment, developer (acid) developed in combination with pigment and depigment (alcohols) that blocks combination of pigment and developer. In low temperature, developer and pigment combine and develop; in high temperature, develo