Try these sites for information on Tyrian Purple and the molluscs that produce it: http://www.middlebury.edu/~harris/Classics/purple.html http://www.chriscooksey.demon.co.uk/tyrian/ http://www.sanders-studios.com/tutorial/historyanddefinitions/pigmentspast.h tml http://www.virtual.co.il/orgs/orgs/tekhelet/brochure.htm Paul M.