Doug,
  I do not have any of the shells that you are interested in but you might
want to look at a technique that was described which uses chlorine and UV
light to bring out color patterns in fossil shells.  The citation is
 
Katherine Kamp Krueger, The Use of Ultraviolet Light in the Study of
Fossil Shells. Curator 17(1): 36-49 (1974).
 
Let me know if you try the technique.
 
Charlie
****************************************************************************
 
Charlie Sturm, Jr
Clinical Instructor - Family Medicine
  University of Pittsburgh School of Medicine
Research Associate - Section of Invertebrate Zoology
  Carnegie Museum of Natural History
 
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On Sun, 8 Feb 1998, Douglas Nolen Shelton wrote:
 
> I would like to obtain specimens of Cypraea problematica and Cypraea
> carolinensis with color, pattern, and gloss still intact.  Please EMail me if
> you can help me out.
>
> Doug Shelton
>