[pure-silver] Re: baking soda as wash aid
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 17 Feb 2005 15:58:18 -0500 (EST)
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: baking soda as wash aid
Date: Thu, 17 Feb 2005 12:52:56 -0800
> It may be alkaline enough to work the way a carbonate
> bath does but does not have the ion exchange properties of
> sulfite. I don't have the Kodak paper on wash aid readily
> available at the moment but I think sodium bicarbonate was
> among the salts they tested.
Sulfite, sulfate, bicarbonate, chloride, etc. all have some ion
exchange property. It's just that some are more effective than others.
Levenson demonstrated the importance of bicarbonate in wash
water. Pure water was a much poorer washing water than the water
containing some bicarbonate.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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