Are the usual smoke detector test smoke products such as "Smoke Sabre" and "Smoke Check" safe to use in historic houses?  I see the MSDS lists the following: isobutane, siloxane, butane and propane.  While I do want my smoke detectors tested, I'm wondering, if these are 
(a) safe for historic walls and ceilings, etc., and (b) if not, is there a safer alternative that I should request?

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