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> > > As glass becomes brittle over time, I guess it becomes less > > > dense and hence allows more UV radiation in. > > > Uh? You mean the glass gets thicker, or lighter? > > I think Dave is trying to diplomatically say "No way!" Well, does glass become more brittle over time or not? I thought it did. If it does, something has to give, so I'd say the glass must become thicker. Probably not thick enough to measure at home though. -Mark Fuhriman ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe