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Substitue KBr for KI in Crawley's FX-1?
wrote in message ... Is this a reasonable substitution? If so, how would the two compare by weight? (The formulary is out of KI, whereas I have plenty of KBr.) Potassium iodide is an anti-foggant but has other properties, mainly it was used in some older developers to reduce pressure marks. I don't know why Crawley used it in his formula. Usually its used in very small amounts. I am not familiar with what else is in FX-1, my memory of Crawley's formulae is that they are a bit exotic. Most film developers have little Kbr in them, perhaps 1 gram/liter of working solution. You will probably have to experiment. -- Richard Knoppow Los Angeles, CA, USA |
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