From: julian smart (julian@jsmart.fslife.co.uk)
Date: 08/21/02-02:45:44 PM Z
Hi,
one thing I have noticed when doing a batch of VDB prints, is that if I mix
all three solutions together to make a single working solution it just
doesn't last. It seems to go off (oxidise?) and makes producing a decent
print impossible even the next day.
I tracked the problem down to the tartaric acid, having found that the other
two solutions will keep well for months in dark brown bottles. The tartaric
acid solution will not work even the next day. I figure the cost of the
tartaric acid to be almost negligible and therefore mix this fresh before
any printing batch- a bit of a pain, but I always get a decent result.
The f.A.citrate, btw , will always generate a certain amount of sludge on
storage. I have found this to be harmless to my prints as long as it is not
disturbed in the bottom of the bottle..
All the best,
Julian.
----- Original Message -----
From: "Don Bryant" <dsbryant@mindspring.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, August 21, 2002 12:15 PM
Subject: Re: Van Dyke Brown Mixing question
> ----- Original Message -----
>
> >
> > Don:
> >
> > I went through this same problem with the list a few months ago, and
> > subsequently have mixed in part C very slowly as per the advice I
> received.
> > The batch I made last Sunday was pretty much clear by Monday evening,
with
> > just a little sludge. Yours will probably be fine tomorrow.
> >
>
> Thanks Clay, I'll keep an eye on it.
>
> Don Bryant
>
>
>
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