Screen Security Photochromic Solar Sensitive Ink

Screen Printing Photochromic Ink is wide use in many security area:like security pacakge,UV test card,cloth printing ect. Solar sensitive ink are not colorless or without imprinting. On pure white paper, even if completely transparent and colorless varnish is printed, there will be visual differences due to the difference in refraction and reflection coefficients of the paper and varnish, resulting in the difference between oil stains and the brightness of the paper surface. The invisible effect is better in the following situations: (1) Printed on rough and absorbent paper; (2) Printed next to line text, etc.