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I want to mount some cyanotypes and they need an acid environment to stop them fading. Most of the mount board I can find is buffered and I assume at least pH neutral if not alkali. To make life more difficult I would like a dark green or dark grey board. I can find a few suppliers of unbuffered boards in cream but that seems to be about it. Does anyone have any suggestions?
As an aside, what makes a board acidic, would a really cheap board be acidic anyway? Could I use a neutral board and do something to make it slightly acidic?
As an aside, what makes a board acidic, would a really cheap board be acidic anyway? Could I use a neutral board and do something to make it slightly acidic?