(continuing) reply to Knut ... I have no direct answer to this modification of the known process cleaning combs and hives contaminated by nosema ... but I have some about the binary system "acetic acid/water" (60-40). First, water will evaporate (not pure water, but a mixture of water (97 %) and acid (3 %)) until all the water is lost. Then the acid will evaporate as a pure product. Thus, it seems to me to use more mixture (150 ml) for a longer time (2 weeks? in closed room, water will get out very slowly). Regards JMVD ----------------------------------------------------------------------------- Jean-Marie Van Dyck Fax +32 81 72 42 72 B.P. 102 email : [log in to unmask] B-5000 NAMUR(Belgium) Medical school - Biochemistry dept -----------------------------------------------------------------------------