This heavy slab, traditionally made of stone or metal, serves as the mixing and spreading area for thick printing ink. A press operator works the ink back and forth across the surface using a brayer or inkballs to break down its tack and achieve a uniform film thickness. A properly prepared block ensures the roller picks up a consistent charge for every impression.
Heard on the job
Scrape down the ink-block before you mix the spot color, or the residue will muddy the yellow.