[alt-photo] Re: A PVA postscript

[Vedos]

Hi Loris,

Are you saying that you didn't shrink the paper, just sized with the diluted glue, and were able to print 8-9 layers in register?? Interesting...

I have also used this glue:
http://www.kiilto.com/en/products/product_database/?prod=887

experimenting with dilutions from 1+4 to 1+8...

Regards,
- Jalo

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
V E D O S
Alternative Processes in Photography & Printmaking
Satakunta University of Applied Sciences
Faculty of Business and Culture Kankaanpää
Paasikivenkatu 24, Box 76
FI-38701 Kankaanpää
vedos at samk.fi
http://vedos.samk.fi
http://www.samk.fi

________________________________________
From: alt-photo-process-list-bounces at lists.altphotolist.org [alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of Loris Medici [mail at loris.medici.name]
Sent: Saturday, April 03, 2010 12:08 AM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: A PVA postscript

FWIW, I don't use Gamblin PVAc Size but a PVAc glue product with a
syrupy concentration. (Presumably considerably more concentrated than
the Gamblin product.) I dilute the glue 1+4 with water and apply
thoroughly to non-shrunk paper. Works perfectly with both Fabriano 5
HP and Fabriano Artistico HP. Fabriano 5 surface is softer and
nappier, when compared to Artistico - pretty different. Works equally
well with both... We did 8-9 layers w/o additional sizing and no (or
barely-negligible) stain.

Anyway, I wanted to say maybe the concentration of the size is too
much in your case; why not diluting more? (Such as 1+2 or 1+3...) What
is the strength (and bloom) of the gelatin sizing you were using? I
think you have to match the effect/strength of the new sizing to the
old one if you do not want to change your workflow. (Obviously, except
for the sizing step.)

Good luck and thanks for sharing...


2010/4/2 Henry Rattle <henry.rattle at ntlworld.com>:
> My first, reasonably successful, trials of PVA as a size for tricolour gum
> were carried out on paper which had not been preshrunk. Not a good idea, as
> it turns out. Moving on to using Gamblin PVA at 1+1 dilution for prints on
> preshrunk paper, I find that while Fabriano Artistico (cold-press,
> traditional white) still works reasonably well, my favourite Saunders
> Waterford HP reacts badly. After preshrinking under mild conditions (1 hour
> in water at 25C) first gum (yellow) coat seems to work OK, but the
> subsequent (magenta) coat is horribly blotchy and clears very badly and
> unevenly. Looks as though internal sizing has washed out so that the PVA
> doesn't go on evenly. A control with gelatin sizing looks fine with the same
> coating and treatment.
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