Re: Van Dyke Reducer

I'll answer my own question. The formula works fine without the potassium
bromide (so far anyway). I bumped up the potassium ferricyanide to .3 or .4
g. Used the same sodium thiosulfate 5 g. Took about one to two minutes to
"brighten" up the print. Perhaps someone could explain what the how the
potassium bromide affects a VDB print when used as a reducing agent. Thx.

~m

----- Original Message -----
From: "Michael Koch-Schulte" <mkochsch@shaw.ca>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, December 16, 2005 4:32 PM
Subject: Van Dyke Reducer

> Wynn White's article on VDB lists:
>
> Potassium Ferricyanide .25 gm (one micro spoon used for
> stirring coffee)
> Potassium Bromide .2 gm (10% solution 2 ml.)
> Hypo 5 gm
> water to make 1000 ml.
>
> as the formula for Van Dyke Brown reducer. I don't have Potassium Bromide
on
> hand. Is there something I can use as a substitute? Is there another way
to
> reduce a VDB?
>
> ~m
>
Received on Fri Dec 16 16:58:48 2005