Regarding testing, the Canadian Conservation Institute (CCI), 1030 Innes Road, Ottawa Ontario K1A 0C8, does much testing of materials and publishes their findings in CCI notes (French and English, combined) and Technical Bulletins( available free of charge). They can be reached by tel: 613-998-3721 or fax 613-998-4721. I don't believe they receive any funding from the U.S. govt. or institutions, so I am careful when taking up their time. Christine S. Allen Director of Outreach Services [log in to unmask]