Citric acid for kallitypes

Johnindc · 10-01-2008, 06:29 PM

My kallitypes clear in fresh sodium citrate to which I have added a small amount of oxalic acid. If I put the developed print in 2% citric acid (20gms/L) to insure complete clearing the image fades after a minute and is irreversibly bleached after 3 minutes and will not recover in toner and hype. I checked my cirtic acid solution and it has a ph of 1 which must account for the extensive bleaching. Im I doing something wrong? Prints are made on Lenox 100 paper, but I have had similar results with other papers.

doughowk · 10-01-2008, 06:42 PM

I use 3% citric acid bath for clearing step with no problems. Try skipping the sodium citrate/oxalic acid step.

Anupam Basu · 10-01-2008, 06:51 PM

Quote:

Originally Posted by Johnindc

... and will not recover in toner and hype.

Only digital images recover with hype

.

Sorry, John. Let's return to the problem.

Johnindc · 10-01-2008, 07:23 PM

Doug,

The sodium citrate/oxalic acid is the developer.

nze · 10-02-2008, 02:33 AM

As Doug wrote , you may try to use a sodium sitrate developer , without any oxalic acid in it. If you want an acid developer you may add citric acid in it. I use potassium citrate developer and I have no problem with a clearing bath in citric acid. I followed with a palldium toner made with citric acid.

doughowk · 10-02-2008, 09:48 AM

For developer (whether Sodium Citrate or Ammonium Citrate & Sodium Acetate) I only use about 3 grams per liter of Tartaric Acid (also Potassium Dichromate depending on neg contrast). Oxalic Acid I suspect has other properties other than as a preservative (ie, see Darkroom Cookbook, 3rd edition).

Mark Fisher · 10-03-2008, 06:58 PM

Another thing to try is using hypo clear as a clearing agent. I've used PermaWash with good results.

Johnindc · 10-03-2008, 07:47 PM

Actually, I don't have a problem clearing my prints with developer alone. My real question relates to the bleaching of my prints in 2% citric acid which is the recommended concentration.

Andrew O'Neill · 10-06-2008, 10:43 PM

I don't understand why you would want to clear and develop at the same time? I have very consistant results with a straight sodium citrate developer, and then clear in 3% citric acid for 1 minute. If you say you are able to clear your prints in the developer, then maybe the extra time in 2% citric acid bath is not necessary. Just rinse well, fix and then put through HCA followed by a thorough washing.

philsweeney · 10-07-2008, 05:10 AM

I have always been lucky using 20% sodium citrate as developer (nothing else added) and then using 3% citric acid for clearing. Actually the prints are clear leaving the developer after 8 minutes but I still run them for 3 minutes in citric acid. They do bleach some but the toning brings it back. I still always follow Sandy King's article to the letter and still do the washes in between. My city water must like Kallitypes, and if only I would have been as lucky with paper.