Regular E-6 bleach contains Ammonium Ferric EDTA and either Ammonium Bromide or Potassium Bromide, so obviously the Ammonium does not hurt. It also does not hurt, if some of the silver gets dissolved in the bleach, in fact PE once mentioned, that the best bleaches are weak BLIXes.
That's correct, but AFAIK Ammonia can dissolve Silver Bromide in all but trace amounts, so Murray's bleach may even work as B&W reversal bleach.In those processes that makes sense, because you are going to clear out all the silver at the end anyway. I was trying to think about a B&W reversal use where maybe with enough ammonia and ammonium chloride, you could use a single bath and the rehalogenation to silver chloride and dissolution in ammonia would happen at the same time. You'd not want it to clear out the silver bromide and iodide, though, so if it's too strong a general fixer that wouldn't work.
I cleared a developed leader in less than 2 min and it was indeed cleared as well. I am somewhat distrustful in nature so give C-41 7 min. Not the best, I know, but I'm in no hurry.
@Murray Kelly: your adaptation of the Ferric EDTA bleach is very interesting. I should try it one of these days. What is the temperature you recommend for bleaching?
Raghu, I work at 30C but correct me if I suggest that after the developer and wash anyting down to 25C will work.
It is quite difficult to detect incomplete bleaching with C-41 material due to its orange mask. Make sure you test the bleach with E-6 material, or have a setup ready to test for retained silver.Thanks! I've had good results with ferricyanide bleach (Kodak SR-29) in C41 processing but always worried about dye stability. Your ferric EDTa + ammonium chloride bleach might put my worries to rest. Bookmarked your earlier post detailing the formula.
It is quite difficult to detect incomplete bleaching with C-41 material due to its orange mask. Make sure you test the bleach with E-6 material, or have a setup ready to test for retained silver.
Rudi, do you have any idea the FE EDTA shelf life? I found mine (after several days) at the back of the cupboard, and it won't make a bleach of any sort even tho the last lot I made is still good. It's a bit disappointing.
Very cool! Will try.
In my lab, we use it to deplete red blood cells from spleen cell preps so that all that is left are white blood cells.What is Ammonium Chloride used for?
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