If the mask can be diluted with water when it is found to be
thickening up, my sense, like Will's, is to use water rather than
ammonia so as to keep the paper as neutral in pH as possible. I wish
I understood more of the chemistry of this! : )
Water has worked for me with most traditional watercolor gum
friskets, with the exception of rubber cement, which I have thinned
with rubber cement thinner. I've been told to avoid rubber cement as
a frisket for watercolor paper but don't remember why.... Used to use
it a lot in my commercial work, though. I'm intrigued by all the
different tools you all say you use to apply the frisket!
On May 5, 2011, at 10:45 PM, Anne Runyon wrote:
> I was wondering. The works I have done are illustrations, not fine
> art, but nonetheless I do hang on to my originals.
> Does this mean that the mask might not be a good idea at all, even
> undiluted? It does rub off completely,
> once you have finished with the background painting and then the
> paper receives paint normally.
> From: Smith Will
> Sent: Thursday, May 05, 2011 6:27 PM
> To: [log in to unmask]
> Subject: Re: [SCIART] masking liquids
> Iím no chemist but I would think there would be a problem with
> introducing a strong alkali to paper. One of the features of
> archival paper is its neutral PH.
> Will Smith
> Project Officer (Botanical Imaging)
> Environmental Sciences
> Department of Environment and Resource Management Toowong Brisbane
> Telephone (07) 38969508
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