Is one kind of ink which will change color when soaking, it can be made of 
reversible color fading ink and irreversible pervasion ink.

Reversible Soaking Fading Ink :

Water-based ink, with white color in appearance, will turn transparent when it is soaked, 
then recover white color without water.

Application
 

Kids toys printing, water drawing pad, arts and crafts, security label etc.
 

Printing Way:
 

Silk-screen,  Gravure 

For reversible soaking fading ink,  suggested to use 200 mesh 
water-based silk-screen to print.

Effect Photos:

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