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

[phot...@gmail.com]

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.)

[Richard Knoppow]

<phot...@gmail.com> wrote in message
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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
dick...@ix.netcom.com

[Lew]

Well, as I read further, Anchel states that the properties of the
iodide as opposed to bromide have never been fully investigated. So
I'll have to locate a source for the iodide. It turns out that
aquarium supply stores carry several brands for coral & crustacian
nutrition.