Charles,
>
Thanks. My FAC is from Photographer's Formulary rather than B&S. I'm
relieved to know someone else gets a precipitate since it is NEVER
mentioned.
>
I always get the precipitate no matter how slowly I dissolve the silver
nitrate. Usually when 5 to 8 ml of silver nitrate remain to be mixed.
I add the entire amount of AgNO3 and then filter after stirring thoroughly
with a magnetic stirrer. After letting the new solution ripen for 2 or 3
days I filter again and use the mix. Eventually, after a period of time, I
will see a gray precipitate at the bottom of dropper bottle, which I ignore.
Contrary to what is often reported, the VDB mixture in my darkroom, has a
limited life span of about a year.
And FWIW, I've used multiple sources for FAC and silver nitrate and have no
preference of one or the other, so I usually order from Art Craft since
their FAC is a little less expensive and shipping costs are less.
Don Bryant
Received on Mon Apr 10 11:57:17 2006
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