I too have heard that this works. It was a long time ago and I don't know if it is true. Maybe I could hold some in my teeth next time I go to the dentist. - -Mark >>> Iain Whitehouse 1 August 1996 6:00 pm >>> Talk of sunlamp erasers reminds me of once being told that OTP devices (without windows !) could be erased using the magic of 'X rays'. Was my source horribly misinformed ? Did he dream it ? Was he making it up to test me ? Is the mere idea scoffable or is there possibly any truth in this legend..... I would be intrigued to know if anybody has heard of this or has evidence to prove or disprove it. My curiosity is heightened especially after recently returning from holiday to find the cruelly twisted remains of some 20 PIC'54s festering in my waste bin after my colleague's non too successful attempts to program the right hex file in them. Iain Whitehouse C.A.Technologies Ltd. , Malvern , UK