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. Liam -----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? Thanks, Camden Hardy camden[at]hardyphotography[dot]net http://www.hardyphotography.net
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