Two-layer acetate film of red or amber (amberlith) emulsion on a clear base for making color separations by hand. Obsolete with DTP.

A separable two-layer acetate film of red or amber emulsion on a clear base. It has dozens of uses in graphics, most often for color separations by hand. to top

Clear orange coating on an acetate base, used in preparing camera-ready artwork when one or more colors will be used. Also know as amberlith.

Red-masking material opaque to light, which is used to mask out areas that need to remain, unexposed to light.

Ulano trade name for red masking film.

Rubylith is a brand of masking film, invented and trademarked by the Ulano Corporation. Today the brand has become genericized to the point that it has become synonymous with all coloured masking films.