> What is ruby lith? I need to find a source and don't even know what it > is (using as my red filter for my enlarger - possibly)
Rubylith (one word) was (and still is, if it's still available) a trade name for transparent red masking film used in the graphic arts (notably in the making up of flats for offset printing, known as "stripping") as a photo-opaque film (orthochromatic photosensitive materials like offset printing plates are insensitive to red light). Cut-out areas in printing flat could be covered with Rubylith to eliminate printing marks on the plate caused by light exposure.
From the Madison Avenue-ese "ruby" (meaning "red") + "lith" (as in offset lithography).
-- Found--the gene that causes belief in genetic determinism
On Oct 8, 2:36 pm, laran <ArtPis...@gmail.com> wrote:
> What is ruby lith? I need to find a source and don't even know what it > is (using as my red filter for my enlarger - possibly)
> thanks
> Laran
Laran
I used to use it from time to time for Safelight filters. Used to get it from an art supply shop. They had it in 20X30 or about that. I still have some but have not used any in years. Do a google search. Maybe Amazon.com has it.
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