Pigment in general do not need to drying, can be used directly, but, except for ABS and NY masterbatch, they shall be dried according to the conventional process.  

How long the shelf life of pigment?  

Pigment can be long-term preservation.  

Pigment dispersing pigments in fixed in the carrier resin, in a closed state, even if the long-term storage of their quality will not change. But should be stored in a dry, cool environment.