If you want sources of fluorescent powders, yes these are listed in Kearns and Inouye, Techniques for Pollination Biologists. University Press of Colorado. If you need more information, contact me. Dr. David W. Inouye Dept. of Zoology, University of Maryland, College Park, MD 20742 E-mail: [log in to unmask] Phone: 301-405-6946 FAX: 301-314-9358