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  1. #11

    Join Date
    Jul 2011
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    2,591
    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.

  2. #12

    Join Date
    Jul 2010
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    259
    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.

    Click image for larger version. 

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