1.Change color under sunlight or UV light
2.Change form :transparent --vivid color --transparent
3.SGS,MSDS TEST

 1.photochromic pigment :

Under Ultraviolet light or sunlight .color change from white color or very light color to RED ,YELLOW,BLUE ,PRUPLE color .Once away Ultraviolet light or sunlight  it will raback its white color or very light color .This process can repeat again and agian .

2.Basic color :

   Red ,Yellow, Blue ,Purple (after changing color form )

3. Change form :

     White to yellow color