[alt-photo] Re: A PVA postscript

[Jeremy Moore]

Henry,

Do you preshrink at a high temperature? I haven't had a problem with
preshrunk paper, but I preshrink at a lukewarm temperature.

Diana,

I think you have it backwards--it worked well when the paper was NOT
pre-shrunk. Henry is having problems with pre-shrunk paper.

-Jeremy-

On Fri, Apr 2, 2010 at 12:08 PM, Henry Rattle <henry.rattle at ntlworld.com>wrote:

> 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.
>
> Wonderful stuff, gum - just one variable after another...
>
> Best wishes
>
> Henry
>
>
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