[pure-silver] Re: PMK
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 28 Apr 2006 15:15:38 -0400 (EDT)
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: PMK
Date: Fri, 28 Apr 2006 09:57:43 -0700
> FWIW, Kodak research showed that if its desirable to
> remove all hypo from the paper base an oxidizing hypo
> eliminator like the old Kodak HE-1 is necessary. Since HE-1
> will not remove silver complexes from the emulsion its
> necessary to treat the print with Kodak Hypo Clearing Agent
> first, followed by a wash, followed by HE-1 with potassium
> bromide added (1.0 gram / liter of HE-1), followed by a
> wash. At one time Kodak recommended this procedure. The use
> of a sulfite bath or KHCA before the HE-1 also eliminates
> occasional stainging in the HE-1. HE-1 should NEVER be used
> on film. It purpose above is only to remove hypo from the
> paper support of fiber prints, probably not necessary.
HE-1 should never be used on film or paper. Period.
HE-1 can oxidize a small part of silver image, which can later cause
blemish, mirroring, and other symptoms associated with oxidative
degradation of silver image.
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