Thanks to Donald for the sane and very well informed response to the mercury scare. Terrors like Minamata, which was caused by methyl mercury should not be associated with elemental mercury. I have long been convinced that the other chemicals involved in Daguerreotypy, especially Bromine, are much more dangerous than Mercury. A laboratory grade fumehood, gloves, careful monitoring, as well as other precautions are of course obligatory, but the danger to others is relatively small. That said, there was a case of serious mercury poisoning in recent years of a Daguerreotypist in Australia. He was improperly using the wrong kind of fume hood, and exhausted the mercury fumes directly back into his darkroom.