The following just came in to me from Joe Traynor: Re: oxalic acid: Under high heat oxalic acid turns to formic acid (with the release of carbon monoxide - CO); so you may essentially be treating with formic if you're using the evaporator. I didn't believe this at first but a beekeeper (smarter than me) sent me a spec sheet on oxalic. I ran it by a person with organic chem background and he said "of course" - he knew the chemical formulas for both - knock a C and on O off oxalic and you've got formic. Both are hazardous - formic probably more than oxalic. FWIW. Adrian -- Adrian M. Wenner (805) 963-8508 (home office phone) 967 Garcia Road [log in to unmask] Santa Barbara, CA 93103 www.beesource.com/pov/wenner/index.htm ************************************************************* * The most formidable weapon against errors of any kind * is reason. * Thomas Paine, 1794 ************************************************************* :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::