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You could be right, Will, but an enormous number of watercolor artists use masking liquids without any (apparent) damage to the paper.  Ammonia is a component of most masking fluids.  It's a volatile substance, and would tend to dissipate shortly after being applied to the paper.  That said, I've never researched tests to be certain it doesn't change the paper to some extent.

b

On Thu, May 5, 2011 at 6:27 PM, Smith Will <[log in to unmask]> wrote:

I’m 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 Australia
Telephone (07) 38969508



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