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Rubylith is a transparent red masking film originally developed by the Ulano Co. It is still used in some screen printing processes and photo-lithography.

Rubylith is used to cover daguerreotype plates during the Becquerel developing process so that only red light falls on the latent image on the plate. Holders are constructed of various materials (cardboard, wood) to hold the plate, protect it from stray light exposure, and allow for a rubylith covered window above the exposed side of the plate.

Rubylith has mostly replaced Amberlith - a more orange-red masking film that is no longer being manufactured.

This page was last modified on 30 December 2011, at 15:49. This page has been accessed 3,650 times.