This is a microcapsule product with a photochromic dye which changes its color by light. The photochromic dye causes color change reversibly by light. When it is exposed to ultraviolet rays (sunlight), it causes color formation, and when a light is blocked, it has its original color.

When photochromic microcapsule is exposed to sunlight like UV rays, the structure of the internal substance
of the capsule changes and thus it has color.
And when light is blocked, the internal substance of the capsule returns to its original state, and 
consequently its color disappears.

* Application ; Textile, Coating, Plastic Injection, Ink