Chemical discoloration ink: chemical discoloration ink refers to the change, erase and chemicals used with color, discoloration and fading reaction of ink. Mainly used in printing checks, drafts and documents. For example, some people are altered in bill denomination figures, will immediately appear " cancel ".

( 1 ) chemical change color printing ink: ink printing, use of special chemical pen graffiti, the original color faded, color change irreversible;

( 2 ) chemical change color ink: ink printing, use of special chemical pen graffiti, showing color painted in place, color change irreversible.

Printing: offset printing, water-based screen printing