[pure-silver] Re: PMK

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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