Re: Gum arabic with Cyanotype emulsion

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From: Don Bryant (dsbryant@telocity.com)
Date: 01/24/01-10:00:19 PM Z


Judy,
> I've learned not to generalize from the particular in anything alt (tho
> sometimes in life?) -- however I did try a cyanotype formula with gum
> arabic addedfrom some "expert" book or other.
>
> Feh !!
>
> It might help if some other conditions are lousy, sort of even things out.
> Or let's say, it MAY have done something for someone sometime -- tho the
> first cause lost in the mists of time, as far as I can tell...

My meager experience printing cyanotype certainly doesn't compare with the
"pros" on this list such as yourself. But I seem to have problems getting an
even coating with cyano regardless of the paper. When coating with a hake
brush I get streaking. When using a puddle pusher I get puddling on one side
of the print and thinning on the other . All of these problems seem to be
caused by the paper absorbing the emulsion faster than I can move it around.
In particular coating for an 8x10 negative is quite problematic. The RH in
my coating area has been quite load and may be causing the paper to suck the
emulsion in too rapidly. Thus my curiosity about the use of gum.

Thanks,

Don Bryant


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