Response to Champlin #17

Whew! That is about everything but the kitchen sink. It makes some sense, except I've never seen nickel ammonium sulphate used in photo chemistry. It really wouldn't be too expensive to make up except for that- Photographer's Formulary sells in reasonable quantities, but the nickel compound would have to come a general chemical supplier- Fisher wants about $100 for 500g, but there are probably cheaper places.

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