Slick: from smooth surface to printing proof

To most people, "slick" means smooth, polished, and frictionless. A slick road. A slick sales pitch. The word carries connotations of ease and surface shine.

In printing and industrial supplies, a slick is something entirely different: it is a camera-ready photographic print or artwork prepared for reproduction. The slick is the intermediate stage between the designer's work and the finished printed piece. A photographer or printer photographs the slick to create a film negative, which is then used to burn a positive offset plate or to expose other printing devices. The slick itself must be sharp, high-contrast, and free of defects so that the reproduction chain yields a clean final image. The term has nothing to do with glossiness, though slicks are often printed on glossy paper stock to support the photography step.

Metalworking borrowed the term in a related but distinct sense. A slicker in the metalworking trade is a curved hand tool, usually made of steel, used to smooth the surfaces of a mould cavity after the pattern has been withdrawn. The slicker polishes and refines the mould surface before the next casting run. Here the word does connect to smoothness, but it names the tool, not the surface condition.

The divergence reflects the different demands of each trade. In printing, the term evolved to mean the prepared original itself, the "slick" proof that can be handled and photographed without damage. In metalworking, the tool that produces a smooth surface took the name because of what it does. Both uses emerged from the shared sense of producing or having a smooth, refined finish, but they settled on opposite ends of the process: one names the input to photography, the other the tool that creates a finished surface.