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At 09:03 PM 2/23/2005 -0500, Jerome Hartke wrote: >Does anyone have solid data showing that CD's are especially sensitive to >UV? I see this mentioned rather frequently, but without supporting data. >CD's are sensitive to IR, since that is the wavelength used for recording. I have done simple tests using sunlight - whether the effect is due to UV, visible light or heating I cannot say. The 'test' consisted of setting discs with cyanine and phthalocyanine dyes in sunlight (Southern California, summer) for a few hours. They were dye up and half of each disc was covered with a card; all discs had been recorded. The phthalocyanine showed no discoloration but the error rate increased; nevertheless, it was readable. The cyanine was visibly bleached and was unreadable. Quantitative testing is possible in a lab and the effort should not be great if precise measurement is not required. Mike -- [log in to unmask] http://www.mrichter.com/