RE: Roller for gum (was: Re: humidity in your darkroom........

From: Keith Gerling ^lt;[email protected]>
Date: 01/18/04-05:10:18 PM Z
Message-id: <>

I my experience, humidified paper: 1) has absolutely no effect on DMAX, and
2) greatly eases the coating process. In fact during winter months in
Illinois, where the humidity dips into negative territory (and the both
paper and human skin become dry, crackly, and draw moisture from anything
they touch) I find it to be essential. Otherwise, the the gum emulsion
will dry on one part of the print before the other side is even touched.
Even with humid paper, I sometimes have to resort to a few spritzes from a
squirt bottle in order to maintain consistency while I even out the
emulsion. Obviously, it is different in the summer, when I have to resort
to a hair dryer just to get the emulsion to dry the same day I coat it.
Such is life in the Midworst...


From: []
Sent: Saturday, January 17, 2004 6:24 PM
Subject: Re: Roller for gum (was: Re: humidity in your darkroom........

  I don't do any gum yet, but I wonder if humidified paper would lead to
easier coating? And, how much would humidity effect DMax (maybe not so
much?), Tonal Range, eveness, etc working with Dichromates? According to
Sandy King, it sure does have an affect on Carbon, and Carbon uses
dichromates.... hmmmmmmmmmmm

  Mark Nelson

  In a message dated 1/17/04 2:29:04 PM, writes:

    I agree with Dave about humidity having little effect on gum. But I have
    wondered if perhaps humidity might have something to do with the fact
    that coating with a roller doesn't work for me.

    At the time that I reported my failure with the roller, I tried to post
    a jpeg to the Bostick & Sullivan forum, but the upload didn't work, so I
    gave up on it. But while working on my website this morning, I came
    across the jpeg, and now that I know how to FTP things to my ISP's
    server, I thought I may as well put it up for you all to look at.
Received on Sun Jan 18 17:10:12 2004

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