There is a secretion of metalloproteases from Paenibacillus larvae which is fluorescent. http://www.ncbi.nlm.nih.gov/pubmed/8454023 http://mic.sgmjournals.org/content/157/5/1474.short Could be why the scale is fluorescent. Karen *********************************************** 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 Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm