From: Sandy King (sanking@hubcap.clemson.edu)
Date: 08/05/00-10:21:07 PM Z
For the record I need to correct an error in my message below. My good
results with the Argyrotype Process were on Rives Aquarelle, not Fabriano
Artistico as I stated below. I use Fabriano for most of my carbon transfer
work and was momentarily mistaken as to the work with Argryotype. To atone
for the mistake I will test the process with Artistico and report to the
list the results!@!
Sandy King
>I have been printing with the Argyrotype Process of Mike Ware for the past
>week or so and am very pleased with the results (and consistency) on
>Fabrianto Artistico paper. The color of the prints, untoned, is a very
>attractive dark brown and contrast can be changed by adjusting the amount
>of Sulphamic Acid in the sensitizer. However, Argyrotype uses the much
>more expensive Silver Oxide rather than Silver Nitrate. Mike describes a
>way to precipitate Silver Oxide from Silver Nitrate, as follows:
>
>"Alternatively, 7 g Silver(I) Oxide may be precipitated from a solution of
>10.3 g Silver Nitrate by adding a solution of 2.5 g Sodium Hydroxide;
>after filtration and washing, the moist precipitate may be dissolved in
>the Sulphamic Acid."
>
>I don't understand the concept of a chemical being "precipitated from"
>another but I have on hand a large suppy of silve nitrate and would like
>to give it a try. Can someone explain how I would do this in practice,
>especially the part about filtering and washing?
>
>Sandy King
>
>
>
>
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