I had never use OA(V) because It can cause kidney and liver problems. That is what I was told by a beekeeper that did a technical trip to Denmark and Italy some 4 years ago. I also understood that the oxalic cristal are available for a couple of hive inspections, therefore one should use the mask for quite a while after application. Too high the risk in my opinion. Too unconfortable also. It is enough to stand the veil (i am a heavy smoker) to think on using a gas mask. -- Juanse Barros J. APIZUR S.A. Carrera 695 Gorbea - CHILE +56-45-271693 08-3613310 http://apiaraucania.blogspot.com/ [log in to unmask] *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Access BEE-L directly at: http://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=BEE-L