Citric acid for kallitypes

Johnindc

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Jan 3, 2006

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Med. Format RF

• Oct 1, 2008

• #1

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

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Feb 11, 2003

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Kalamazoo, MI

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• Oct 1, 2008

• #2

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

 

Anupam Basu

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Madison, WI

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• Oct 1, 2008

• #3

Johnindc said:

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

Click to expand...

Only digital images recover with hype .

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

 

OP

OP

Johnindc

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Med. Format RF

• Oct 1, 2008

• #4

Doug,

The sodium citrate/oxalic acid is the developer.

 

nze

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France

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• Oct 2, 2008

• #5

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

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Kalamazoo, MI

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• Oct 2, 2008

• #6

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

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Dec 13, 2003

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Chicago

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• Oct 3, 2008

• #7

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

 

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Johnindc

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Jan 3, 2006

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Med. Format RF

• Oct 3, 2008

• #8

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

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Coquitlam,BC Canada

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• Oct 6, 2008

• #9

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

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• Oct 7, 2008

• #10

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.