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Substitue KBr for KI in Crawley's FX-1?

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Old April 12th 09, 11:59 PM posted to rec.photo.darkroom
Richard Knoppow
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Default Substitue KBr for KI in Crawley's FX-1?

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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

Richard Knoppow
Los Angeles, CA, USA


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