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The problem with RA4 chem is not odor, or acid fumes as with Ciba. It's long-term sensitization. No
problem then all of a sudden you can never get around it again. That's happened to a couple of lab
owners I know. I can only work with it outdoors, so actually wheel my dry processor outside during
mild weather, and I haven't even been exposed to much of it over the years.
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Color calculators help a lot with negative printing, if you have the patience and time learn it properly. The picture shows what you can easily find on the used market.
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