[alt-photo] Re: A PVA postscript

[Henry Rattle]

In my case, it wasn't a good idea because I normally pre-shrink - so
shouldn't have taken a shortcut by doing the tests without the preshrink. I
used to be a scientist - should know better!

Best

Henry


On 02/04/2010 16:28, "Diana Bloomfield" <dhbloomfield at bellsouth.net> wrote:

> Thanks for the update, Henry.  So when you say using PVA on paper that
> hadn't been pre-shrunk was not a good idea-- is that because there was
> too much internal sizing in the paper, so hard to coat the PVA, or
> that just meant too much sizing overall, and everything washed off?
> 
> I have to admit, I never had a lot of luck with the PVA, or was very
> happy with the results using PVA-- except on BFK Rives paper (in all
> its varied forms/weights).  I think you'd probably like that if you
> gave it a try.
> 
> Interesting.  Thanks again.
> 
> Diana
> On Apr 2, 2010, at 1:08 PM, Henry Rattle 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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