Wet sensitive ink and say in water color printing ink and water-based ink away, divided into reversible and irreversible extinction color wet sensitive diffusion two.

(1) the reversible away color: drop by colored to colorless color, water droplets volatile recovery after primary colors, color is white-no;

(2) the irreversible wet sensitive diffusion: the printing ink the picture or text, meet after water will permeates gradually spread, designs or words into a fuzzy state, after drying the color of water diffusion will not recover to their original design, use the ink print logo after test, mark can't use again. Used for testing the cell phone battery, electrical appliances product is under water.