U of S | Mailing List Archive | alt-photo-process-l | Re: Bleach-development with gum

Re: Bleach-development with gum

Hi again Keith,

I got wrinkling only in one occasion - but I haven't used sheets bigger than

Why you say that about baby-oiled negatives? We used them in the Istanbul
workshop. (Yes, they were messy if that's your problem - I guess you have to
make a good stock of blotting paper!)

Since you're using/testing el-cheapo paper negatives, let me quote something
that I've read in the HybridPhoto.com forums -> paper shrinks considerably
after the first printing but not much (almost none) in subsequent printings.
Therefore you can just make two sets of negatives after measuring the amount
of shrinking: first set contains only one negative that you're going to use
for the first printing, second set contains the negative(s) you're going to
use in subsequent printings (on shrinked paper) which should be printed
smaller by the same % of shrinking you have measured before...

This is something that was suggested by the user "dwross" - eventually this
method works well for her. (BTW, she has a very interesting website about
silver gelatin emulsion making!)

Anyway, if that also works well for you then you won't need to affix Masa on
the support for dimensional stability - the second negative set (consisting
of smaller negatives) will offset the shrinkage!


From: Keith Gerling <keith.gerling@gmail.com>
Reply-To: <alt-photo-process-l@usask.ca>
Date: Thu, 06 Dec 2007 13:17:36 -0600
To: <alt-photo-process-l@usask.ca>
Subject: Re: Bleach-development with gum

Ok, three observations,

1) the wrinkling and puckering dries down pretty well (but coating is still
2) unsized Masa stains
3) anybody that successfully uses baby-oiled negatives must have the
patience of a saint and plenty of time


On Dec 6, 2007 12:49 PM, Keith Gerling <keith.gerling@gmail.com> wrote:
> Thanks.  I just coated an un-sized sheet and it is drying now and I'm
> concerned.  Does your 3M adhesive-mounted Masa pucker and wrinkle really bad?
> A month ago, I tried mounting with gelatin (doesn't stand up to a long soak)
> and 3M.  I was having problems mounting it evenly, bu now with four hands (my
> son) I mounted several sheets with 3M spray.  The one I just coated was
> puckering before I could get the emulsion smoothed out.  I'm assuming these
> bubbles are from spots of paper not hit with spray, but if I spray any more it
> gets really messy.
> On Dec 6, 2007 12:23 PM, Loris Medici <mail@loris.medici.name> wrote:
>> Hi Keith,
>> Yes it applies to multi-layer prints on Masa too. But I think there's
>> something wrong with my sizing method; I normally size using a 3% 250 Bloom
>> gelatin - sizing + hardening are both done in the same time (I add 1ml
>> formalin per 1g of gelatin into the solution before applying it to the
>> paper).
>> I decided to use a lower gelatin concentration after Christina's advice of
>> brushing harder and working the sizing into the paper's fibers - as I
>> understand it. Perhaps the higher concentration (combined with hard gelatin)
>> was making the surface too slick as Christina suggested.
>> Anyway, I just finished sizing few 1/4 sheets of Fabriano Artisico (no
>> Traditional and/or Extra White designation on the packaging) with 1%
>> gelatin, brushing vigorously -> will report how it went...
>> BTW, the bleach developed print also was done on unsized Fabriano Artistico.
>> Another note: Unsized Masa stains! (Fabriano too, but much less compared to
>> Masa...) So try it both sized and unsized, see for yourself. I may also size
>> few sheets of Masa later (with the new 1% concentration) if all goes well
>> with Fabriano.
>> Regards,
>> Loris.
>> From: Keith Gerling <keith.gerling@gmail.com>
>> Reply-To: < alt-photo-process-l@usask.ca
>> <mailto:alt-photo-process-l@usask.ca> >
>> Date: Thu, 06 Dec 2007 11:59:50 -0600
>> To: <alt-photo-process-l@usask.ca>
>> Subject: Re: Bleach-development with gum
>> Hi Loris,
>> I'm finally getting around to working with Masa.  I noticed in this post
>> that you say you do not size?  Does that apply to your multicoat prints on
>> Masa as well?  I've spent a solid morning in a frigid workroom shrinking and
>> affixing Masa and I don't want to mess it all up.
>> thanks
>> Keith