>As I watched the fog billow over the Baldwin SF10 on stage today, I wondered >what effect this would have on the piano......(fog machine in catwalk, >capable of filling theater) Ron, I haven't heard anything about adverse affects on pianos. The last time I was on stage tuning and someone fired one of these suckers up, I was more concerned with my lungs. So far, I've lived about three years past exposure, so the poison must be extremely slow acting. These machines burn a mixture of propylene glycol, triethylene glycol, and water. The stuff is obviously water soluble, but I don't know if the residue is hygroscopic. It seems like we would be hearing complaints of rusty strings by now, since you can't put on a show anymore without lasers and/or fog. Ron N
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