> http://www.itl.nist.gov/div895/gipwg/StabilityStudy.pdf That's got me thinking about how I store 50- and 100-CD drums. All of their edges are exposed to light, although this room is pretty dim. Maybe they should go in the cupboard or a box rather than on the shelf -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist