Re: pt/pd mounting
Katherine, I apologize for the ambiguity of my question. You (and Liam) are correct; I was in fact trying to find out whether acid board is good (as someone once told me) or bad for pt prints. My instinct was to say acid board is bad in general, but it was a fairly convincing argument. While we're on the subject though, what about buffered board? Can anyone see a reason to use or not use it for pt/pd? Camden Hardy camden[at]hardyphotography[dot]net http://www.hardyphotography.net On Mon, September 11, 2006 12:30 pm, Katharine Thayer wrote: > > On Sep 11, 2006, at 8:11 AM, Camden Hardy wrote: > >> Thanks to Liam and Gawain for the responses. >> >> So that leaves us with one "busted" and one "doesn't really matter". >> >> Anyone want to tip the scales? > > Camden, I don't have any information to tip the scales one way or the > other, but from where I'm looking, the scales are already tipped. > > Your question was > > 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. > > This is a different question, as I read it, than whether using a > buffered board, where the pH of the board has been raised to 8 or 9 > with the addition of calcium carbonate, will shorten the life of the > print. Both of the answers addressed this second question, and it > makes sense that they answered this question, because that's probably > what your vaguely remembered warning was referring to anyway. > > The way I read it, both Liam and Gawain answered this seond question > in the negative: using a buffered board shouldn't hurt your pt > print, Lord willing and the creek don't rise. But the answer to > your original question is also "no," and not just because as Liam > says, a pt print isn't acidic when it's properly washed--even if it > was, you wouldn't want to use an acid board. So you're left with > the choice of whether to use a pH neutral board (100% cotton rag) > or whether you want the additional protection of buffering against > the formation of acid in the print over time. > Katharine > > > > > >> >> Camden Hardy >> >> camden[at]hardyphotography[dot]net >> http://www.hardyphotography.net >> >> >> On Sat, September 9, 2006 8:36 pm, Liam Lawless wrote: >> >>> 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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