Graining is a practical method to remove surface irregularities while imparting a quality textured finish prior to applying a protective coating. The plate to be grained is placed on a revolving surface enclosed in a cylinder. An abrasive is blown by nozzles which move laterally.This kind of graining process is very clean, relatively silent, and results in a regular grain. The size of the grain is regulated by changing the angle of the various jets. The abrasive jet may be either dry or wet depending on the machine used. After graining, the plate must be carefully brushed and washed with water and then properly scoured in order to eliminate any bits of abrasive that might have gotten stuck in the hollows of the plate surface.


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