Mark,
There was a technique described for bringing out patterns in pliocene
fossils. I believe that one soaks the shell in bleach for a period of
time and then exposes it to UV radiation. If you are interested in trying
it, I can did up the reference for you. I believe it was in an issue of
the journal CURATOR.
Charlie
******************************************************************************
Charlie Sturm, Jr
Research Associate - Section of Invertebrate Zoology
Carnegie Museum of Natural History, Pittsburgh, PA
Assistant Professor - Family Medicine
[log in to unmask]