Has anyone heard of photochemistry destroying PVC? I've received an email stating that this is occurring. We use both black and white and color chemistry. Direct emails are appreciated since I digest this list. Thanks, Kim Kim Mosley Dean, Liberal Arts St. Louis Community College at Florissant Valley 3400 Pershall Rd. Ferguson, MO 63135 314-513-4216 kmosley@xxxxxxxxx, http://stlcc.edu/fv/liberalarts/