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Naaa that is an argument without any practical merit in THIS context.
We are not developing color films you know, (most of us) are not printing in the darkroom any more, fewer will in the future.
We employ a modern gizmo called a scanner. This thing cuts through bot fog and color dyes like a knife in butter.
It is also fully color sentisive, so we can scan any color we, like and change the colors afterward or even turn the thing into B/W with just one click on a virtual button...
So this was an answer looking for a good question....
For your information we come from a running debate on Caffenol, where the guys demand to exchange KBr with iodized table salt, large amounts of it, and accept the acompanying yellow stain as if nothing happened....
Why is this on APUG?
Very nice. Congratulations.
Look up Boric Acid in Wikipedia. That may give some help.
PE
There is also a button with the label "advanced search", it does wonders.One last thing: It is common courtesy, when there is a thread adressing the subject at hand to give the actual link right here, or ask if anyone remembers / has it, in case it slipped the mind, so that people get to know where to start looking, anythingg else can be seen as footdragging, disinformation and stall tactics - to actually discourage unsuspecting newbies from ever trying out anything for themselves.
Thank you.
One of the posters listed ALL of the methods I used but one and IDK how he missed one important possible compound
Two questions for Ryuji about DS-10 (I hope he's still watching this long thread):
1. Could the Dimezone and Ascorbic acid be kept in a separate concentrate in propylene glycol? I would hope that both concentrate and working solution (containing no developers) would last at least a year. Before using, some concentrate would be added to working solution for one-shot use.
2. If the answer to question 1 is "yes", then are TEA and Salicylic acid still needed? Your older posts indicate they are used to chelate iron to protect the developers to improve storage-life. Does the TEA affect image-quality?
DS-10 and XTOL get some of their fine grain from the solvent-effect of Sodium Sulfite, and we need a substitute for Sodium Sulfite that'll dissolve in Propylene Glycol. That's why I was looking at solvents.
Haist mentions the amino acid cysteine as a silver halide solvent. I know that the amino acid arginine is also a silver halide solvent as it interferes with the classical analysis for chloride with Ag+. Both are available in health food stores as a powder at reasonable prices. They should be soluble in glycols. Cysteine contains a thiol (-SH) group along with many other chemicals which accounts for the halide solvency. Arginine has several amine groups which accounts for its solvency affect. Of the two mentioned cysteine is probsbly better as a first choice.
Would this buffer be effective if those molecules have formed esters with the PG? If not, omitting the boric acid and reducing the metaborate would permit a greater concentration.
BTW, I want to thank those who've posted helpful suggestions in this thread, especially Ron (PE) and Jerry. You guys are a lifesaver! There's no way I could have gotten to this point so quickly (or at all?) without your help.
If your purpose is to tinker about basic chemistry, I think you can find more fun and easier projects to learn basics.
Tests on this line of ideas are not described here on APUG as far as I know.I suggest to scrap that line of effort. The logic is right, but that line of ideas have been tried and retried a great many times, some by myself. Many chemists still prefer sodium sulfite.
So, why dont you pick up a camera and shoot more film? Kodak and Fujifilm need you. Kodak will raise the price in a few months. Time to burn some old stocks and buy more bricks.
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