[pure-silver] Re: William Mortensen's Glycin Developer

On 20-Dec-2004 Koch, Gerald wrote:
> Gradol is paraminophenol hemisulfate.  An equal weight of paraminophenol
> hydrochloride can be substituted.

What is the source for this identification of Gradol?   The booklet "The Edwal
Professional Photographers' Manual" that I have identifies it as "a derivative
of para aminophenol" without being more specific.

--Michael
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