I'm just wondering, apart from the used 'acid free' materials are there any known tests for print degrading substances including formaldehyde, ozone and alkyds? For instance some moulded frame materials can give off some of these. One of RS's constant and accurate observations is that whilst residual thiosulphate and incomplete fixing were often judged as the only guilty parties for image degradation mechanisms, the chemicals in the print's environment were equally to blame, as many inkjet users can testify. I'm musing if mounting materials can be tested for these unwelcome visitors. -- Regards Chris Woodhouse ARPS (a real pain sometimes) ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.