Date: Tue, 27 Feb 1996 14:16:59 -0500 (EST)
From: Judy Seigel <jseigel@panix.com>
To: alt-photo-process@vast.unsw.edu.au
Cc: Multiple recipients of list <alt-photo-process@vast.unsw.edu.au>
Subject: Re: Gum prep and Gloy substitute & tempera
Terry, I've been preoccupied with mundane events & let you get away with
murder here...
On Sat, 24 Feb 1996, TERRY KING wrote:
> 300 gsm papers often do not need stretching.
Do you mean "stretching" or "shrinking"? I haven't yet found a 300gsm
paper (& yes, I have tried some) that won't shrink.
And could we please remember that when Larry says "three days," he is not
laboring for the duration of three days. He is doing an operation that can
take from 10 minutes to 1 hour (depending on amount of paper sized) over a
period of 3 days, or for that matter a month ......or more.
If this includes two coats of gelatine, let me note, BTW, that in my
experience two coats of gelatine is too much -- makes the paper too
contrasty. If you need more gelatine, do another coat in progress.
> Gloy
>
> For a first hardening coat you could try PVA which I was told is an acronym for
> poly vinyl acetate or alcohol which is the basis of Gloy. Mix the PVA powder as
> if it were powdered gum arabic, ie 50/50 with water. try that for size (sorry)
> as it is seven years since I did it. Then mix the resulting gum 50/50 with a
> strong solution of ammonium dichromate. Coat the paper and dry in the dark.
> Expose until the colour changes slightly, then wash until the dichromate stain
Terry, I doubt that the gloy *shrinks* paper any more than
gelatine/glyoxal does, probably less in fact. So would you explain again
why gloy is easier/better?
In fact, since Henkel admits adding colorants, I'd ask do we necessarily
want that added tone? (Gelatine is colorless, colourless too.) And while
I'm on the subject, let me point out that residual dichromate stain from
the gloy hardening affects your image throughout the printing process,
even though it can be entirely cleared at the end. Not being as
clairvoyant as I might wish, I like to judge color as I go along, by
effect.......
> paper treated in this way should not need stretching. The whole preparation
> processs should not take more than two or three hours.
>
. or about what gelatine plus hardener would take.....
> I rarely stretch paper but if the paper is stuck down at the edges with brown
> paper gummed strip available from 'artists colour men' and etching suppliers
OK, I know you meant to say "artists' color persons."
> and then lightly wetted with a brush on one surface only, the paper should
> stretch and dry overnight or in a couple of hours depending on the ambient
> humidity.
I'm not clear about the "paper gummed strip." Doesn't that wash off when
you put the paper in water to develop? And then your paper is free form
again?
Cheers,
Judy
------- End of Forwarded Message