You need more Dektol stock and less water. I used two parts Dektol stock to one part water and 12 minutes, with good results.
Copper Sulphate B&W Reversal Bleach
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You need more Dektol stock and less water. I used two parts Dektol stock to one part water and 12 minutes, with good results.
Hey, good progress. This is nice and lacking in stain and looks quite even. So you are on the right track. Bleach time may be close to right and second developer may be close as well.
I suggest you get a little sodium thiosulfate crystals and add 1g per liter to your first developer. (NOTE do not put this in the second developer). This won’t affect pH noticeably because it’s neutral as @Anon Ymous said. It will lighten your highlights. You may need to then adjust dev time a bit, too. The slide should not be so dark that you can’t just hold it up and look at it.
Well, I don’t have any hypo powder at the moment, so I’m just using straight dev. This was 12 minutes in HC-110 A, and I think it could use a bit of extra dev time. Gonna shoot a roll at 100 ISO and dev for 14-16 mins in HC-110 A tomorrow.
Hello! I'm working on replacing ammonia as the second bath for this reversal method using a copper rehal solution.
The exposure was not good, I shot a test roll for another purpose, but it shows that the idea works.
Instead of an ammonia-selective fixer, I use a concentrated calcium chloride fixer, a new version of a salt fixer. It uses 750g of calcium chloride in one liter of water and works in 15min at 35ºC.
The exposure was not good, I shot a test roll for another purpose, but it shows that the idea works.
Instead of an ammonia-selective fixer, I use a concentrated calcium chloride fixer, a new version of a salt fixer. It uses 750g of calcium chloride in one liter of water and works in 15min at 35ºC.
Very interesting, thanks!
Interesting. Does this work very well on non-reversal frames? If you haven't already perfected it there, I'd try that first since there are so many variables to consider in reversal processing.
Bumping this thread as I have a question.
In troubleshooting my process, I have discovered something rather odd. My copper sulphate bath rehaligenates the film just fine, if I go from the copper sulphate to a black and white fixer, the film clears right away. But, when I put the film in ammonia, it doesn’t do anything at all! It doesn’t clear or anything. I even tried putting it in the 5% ammonia that comes out of the bottle, no dice. What the heck could I possibly be doing wrong?
In troubleshooting my process, I have discovered something rather odd. My copper sulphate bath rehaligenates the film just fine, if I go from the copper sulphate to a black and white fixer, the film clears right away. But, when I put the film in ammonia, it doesn’t do anything at all! It doesn’t clear or anything. I even tried putting it in the 5% ammonia that comes out of the bottle, no dice. What the heck could I possibly be doing wrong?
In my experience, 5% ammonia is slow, like an hour or more. I used 7-8% and still needed 40 minutes at 38ºC. I moved to calcium chloride, which is still slow but does not smell. And ammonia will not clear all, it will leave AgBr I think that is what you are seeing.
To be clear, what I am doing is developing the film fully in the first developer after it has been exposed to room light. Then,I am bleaching in copper sulphate, and attempting to remove any rehalogenated salts with ammonia, but it is not clearing. I know they are being rehalogenated as when I put the same film into fixer it clears almost immediately.
Reduces, right?
Yes, but would it do that if there were bromide ions present from carryover? (But chloride ions are more electronegative, so I'm not sure it would make a difference if there also was some bromide.)
I hope someone who is using the bleach has an idea of what's going on. Good luck.
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- General Treegan
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- Reason: I misstake the threat
So you are rehaling a black film, right? Ammonia is slow when half of the silver is removed if an image is present. If you are trying to remove all the silver with ammonia you will need to increase time, concentration, or temperature.
Sounds like you haven't actually bleached it. Ammonia will only dissolve silver chloride (that's the principle of this bleach) and you must still have mostly bromides and iodides. That would happen if the bleach didn't bleach. Check acidity, time, and amount of sodium chloride.
What film are you using? Is it a film normally used in camera or is it a "process" film, a film used for making internegatives or projection prints? I ask as my attempt using this method failed when I tried to use ECP-2 projection film as a black and white reversal film. It seems that this film was a AgCl based emulsion so was completely incompatible with this selective fixing process.
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