On Apr 29, 13:01, Mark Tapley wrote: I don't remember that exact discussion, but if we had it, my input would have been along the following lines. Firstly, most scanners and photocopier use visible light and have very little if any UV output. Secondly, EPROMs are only susceptible to short wavelength UV, which doesn't go through glass very well. Lastly, it takes about 20 minutes to erase an EPROM an inch away from a normal eraser's tube, and a few minutes to begin to do much harm, so the second or so it would be exposed in a scanner is inconsequential. In other words, don't worry about it :-) -- Pete Peter Turnbull Network Manager University of York