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On Chris Sheppard's comment, I have a good friend who is a museum paper and photograph conservator (and for years I have specialised in photographic archives, as well as being a photographer). The one thing I know is that 95% of "professional framers" drive her nuts, especially (but not only) with regards to photographs. They simply don't know what they are doing as far as conservation standard mounting and framing goes. As far as the comment on Wilhelm's numbers go, first he is a world renowned expert on the longevity and conservation of traditional photographic and moving picture materials. Secondly, there are very few others doing the same level or amount of testing and research, so basically Wilhelm is what we have. From what other research I've looked at over the years in conservation institutes across Canada, the US, Europe and Japan the indications are that Wilhelm's figures seem to be pretty much in the ballpark. Wilhelm is also aware of the limits of his own testing and of various factor effecting the longevity of inkjet materials that still aren't - or aren't yet - taken into account. (Remember Wilhelm was also pretty much the one that showed the much touted and widely accepted figures for the longevity of Cibachrome/Ilfochrome prints were nowhere near their actual longevity by a pretty large factor) is now following The Typepad Team
Feb 16, 2011