ARTHURWG@aol.com
Date: 10/05/02-03:21:48 PM Z
<PRE>According to Schaaf, one reason early salt prints sometimes faded or were
destroyed entirely is that it was not immediately apparent that distilled
water had to be used in washing and in preparing the hypo. Herschel
eventually realized that even trace amounts of muriatic salt found in well
water would react with the "simple nitrate" to form "sulphuret," which
bleached the image, sometimes to extinction. Arthur
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