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Old January 4th 09, 04:33 PM posted to rec.photo.darkroom
Craig Schroeder
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Posts: 26
Default Shelf life for Hypo Clearing Agent?

For Richard K.....

Awhile back, I was trying to locate my old, original source for the
HCA that I've been using..... The label on my bottles had the formula
and I had come to just remix batches from that and had lost the
source. I'm suspicious that it was from something that you had once
posted long ago. I'm usually careful about keeping sources attached
to my formulas and hadn't done so on this. This is what I've been
using.

Sodium Sulfite 200g/L
Sodium Bisulfite 40g/L
Sodium Citrate 10g/L
EDTA TSSalt 10g/L

Dilute 1:9 for use.

Did this come from you? Do you recognize it and its source? Just
tying up loose ends here but I recall in testing that it was effective
and has become my normal HCA for print duties. I've settled upon TF-4
fixer and no required HCA for film use but didn't want to rethink my
sequencing and related issues for toning/fixing, etc for printing and
continue to use this HCA. If not yours, do you have any opinions,
especially in the Citrate and EDTA usefulness?

Craig Schroeder
craig nospam craigschroeder com