Re: H202 and Cold Bath developers

From: Carl Weese (cjweese@wtco.net)
Date: Sat Dec 04 1999 - 15:32:14 /etc/localtime


Nick,

Pure palladium develop out prints are warm in tone: "cold bath"
developer delivers a slightly cooler color than straight potassium
oxalate, but it's still a warm color on Cranes 90# cover.

Don't know why you get less contrast with peroxide, except that 2 drops
is a *huge* amount to put in a 4x5 print. One drop diluted 3:1 with
water should be more like it for a moderate contrast gain. You may be
going over the top, though I've not tested for this. And, what exactly
do you mean by "normal contrast mixture"? If you are using ferric
oxalate #1 and #2, you should not use another contrast agent: add H202
only to an emulsion with just fo #1.

If your highlights are showing a heavy amount of tone or density, you
could be overexposing the print, or simply lacking sufficient contrast,
or you may not be clearing the print adequately. If you need more
contrast, try to get it in your negative rather than with chemicals. The
best prints result from the simplest formulations and negatives with
adequate contrast.

---Carl



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