Van Dyke Brown Mixing question

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From: Don Bryant (dsbryant@mindspring.com)
Date: 08/20/02-09:29:39 PM Z


Dear List,

Tonight I've mixed a batch of VDB solution using the following formula:

Solution A:
Ferric Ammonium Citrate 9.0 gm
Distilled Water 33.0 ml

Solution B:
Tartaric Acid 1.5 gm
Distilled Water 33.0 ml

Solution C:
Silver Nitrate 3.8 gm
Distilled Water 33.0 ml

After weighing and mixing each solution (under safelights) I slowly mix A
and B throughly. Then I add part C slowly to the first mix while stirring.
The result is a milky green solution which I've poured into a storage
bottle. After filling the container a large amount of percipitate rests on
the bottom of the bottle. I don't recall seeing this in previous mixes. Is
this normal? Will the sludge dissolve?

Thanks,

Don Bryant


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