[pure-silver] Re: Pyro Stain
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 26 Dec 2004 13:57:25 -0500 (EST)
From: "Howard F. Efner" <hfefner@xxxxxxxxxxxxxx>
Subject: [pure-silver] Re: Pyro Stain
Date: Sun, 26 Dec 2004 10:19:02 -0700
> UV cut-off of the filmbase is in the region of 325 - 320 nm.
Are you talking about the density of the poly(ethylene telephthalate)
film base itself? Modern emulsions blend latex polymers,
polyacrylates, polyacrylamides, and colloidal silica in addition to
gelatin for the coated layers and some of these may have quite strong
UV blocking properties. And different manufacturers have different
blends.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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