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I would guess they are considered practical ways to get an opaque, microscopically even, pigment deposit on the object without having to paint it on (which might obscure details if a paint was used); presumably one that can be brushed off, as opposed to sticking. But I have no experience with it. > > But I still wish someone would be willing to answer a few questions -- Like > why ammonium chloride or burning magnesium strips? > > best, Julia Morgan Scott > Need to leave or subscribe to the Sciart-L listserv? Follow the instructions at http://citnews.unl.edu/presentmethods_lana/listserv/index.html