Here is a source for isinglass (and it's cheap, too)! Mica composite, 1/32 - 1/6" thick. various sizes up to 3.25x4.5". American Science & Surplus 3605 Howard Street Skokie, IL 60076 Ph 847-982-0870 M-F 8am - 530 pm CST Fax 800-934-0722 Rhea Tannenbaum Exhibits Coordinator Gumbo Limbo Nature Center Boca Raton, FL ____ RheaT