Martin: I received a copy of your message - what is DPX, and where can one obtain it? I am updating information on the use of various antifade (anti-oxidant) materials for fluorescence. Thanks, Marc Marc M. Friedman, Ph.D. Marketing Manager Olympus America Inc. Precision Instrument Division 2 Corporate Center Drive Melville, NY 11747-3157 Tel: (516) 844-5039 Fax: (516) 844-5111 email: [log in to unmask]