U of S | Mailing List Archive | alt-photo-process-l | RE: pt/pd mounting

RE: pt/pd mounting

Platinum prints should not be acidic if properly washed after processing.
But platinum is a catalyst and turns atmospheric sulphur dioxide into
sulphuric acid which causes yellowing and embrittlement of the paper the
print is on.  Old platinum prints are often quite acidic, so I see only
benefits from buffered boards.


-----Original Message-----
From: Camden Hardy [mailto:camden@hardyphotography.net]
Sent: 09 September 2006 18:19
To: alt-photo-process-l@usask.ca
Subject: pt/pd mounting

I've heard a myth I'm looking to bust or confirm, and I figured this would
be a good place to find out.

Someone once told me (can't remember who or where or when) that since
pt/pd is an acidic process that mounting a print in pH neutral or acid
free mat board will actually shorten the life of the print.

So my question is, within the context of pt/pd, how important is the pH
level of mat board for archival mounting?

Camden Hardy


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