Re: Pin holes in my litho

Sil Horwitz ()
Tue, 21 January 1997 9:30 PM

At 01:32 PM 970122 +1100, you wrote:
>In the making of enlarged negatives using litho film and dilute developer (eg
>HC-110 1:7 in 1:4 dilution) nasty little pin holes show up.

Because lith film is high contrast, the pinhole problem is greater. My
"cure" is to add 0.5 grams of PEG 4000 silh@iag.net (polyethylene glycol 4000) per liter
of developer. This is a wetting agent that does not react with the
developer, and insures almost immediate wetting of the entire emulsion. This
lack of instantaneous wetting is ordinarily the major cause of the pinholes.

Sil Horwitz, FPSA
Technical Editor, PSA Journal
silh@iag.net

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