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youpiao wrote:From the APS web site: http://stamps.org/userfiles/file/pcpm/subsidiary_21.pdf
Stamp mounts manufactured by Marlate are quite safe to use. They tested at a pH of 5.33.
I don't cite this to refute your claims, but, rather, to show how alleged "experts" will formulate (and propogate) opinions that fly in the face of direct experience. Shows what can happen when some people use pH as the be-all and end-all for stamp preservation.
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