But regardless, scanning would be causal exposure, and such exposure (even if that glass were UV transparent) would be unlikely to be able to hurt the EPROM. But the only boards with EPROMs I've ever seen that *didn't* have labels covering the windows were ones I did myself or ones where the label glue had dried up and the label fell off. FWIW, I usually use silver write-protect tabs or the black vinyl ones for this purpose; I'd only use white paper on stuff that shipped so I could write a version number on them. Dunno if the tabs are available anymore, but I think I still have a supply... -dq