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Thread: Unremovable dust

  1. #1

    Join Date
    Feb 1998
    Posts
    2

    Unremovable dust

    I process B&W 4x5" sheet in trays, up to 7 with the shuffle method. I have a few time noticed big dust spec. that seem to be sticked to the emulsion . Last time, I noticed such an inclusion on a still wet sheet, on the last wetti ng agent bath and I couldn't remove it by gently rubbing. It eventuelly got off with scrathing but so did the emulsion. The sheets were pre-soaked before develo pping and they came out fairly well exposed/developped.

    Thanks for any hint or suggestions.

  2. #2

    Unremovable dust

    Some of the particulate matter you are finding may come from the water you're us ing to mix your chemicals. If you're using ordinary tap water, try switching to bottled distilled or purified water. Many years ago, I lived in New Hampshire an d had a devil of a time with embedded particles in the emulsion until I switched to distilled water. If the volume of your work will allow, a top notch filtrati on system may also help.

  3. #3

    Join Date
    Aug 2013
    Location
    Atlanta, Georgia USA
    Posts
    1,013

    Re: Unremovable dust

    Make sure the water is "Steam Distilled". Only then will there be no particulate matter in the water.

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