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ruby lith????



 
 
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  #1  
Old October 8th 09, 11:54 PM posted to rec.photo.darkroom
David Nebenzahl
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Posts: 1,353
Default ruby lith????

On 10/8/2009 2:36 PM laran spake thus:

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
  #2  
Old October 9th 09, 12:19 AM posted to rec.photo.darkroom
David Nebenzahl
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Posts: 1,353
Default ruby lith????

On 10/8/2009 3:54 PM David Nebenzahl spake thus:

On 10/8/2009 2:36 PM laran spake thus:

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 [...]


Yep, it's still available: f'rinstance,

http://www.hyatts.com/sign/ulano-rub...15x50yd-T36645

(a little pricey at this site--$213 for a 50 yard roll. Might want to
shop around a little ...)


--
Found--the gene that causes belief in genetic determinism
 




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