Is this the stuff that blackens dredged shells and also Hormospira
maculosa found in intertidal sand in Mexico? I have found that it comes
off if you brush it before it gets dry but won't come off later!

Peggy

On Jan 8, 2005, at 5:28 PM, Bernd Sahlmann wrote:

in 1960, JA Allen  published an article titled "Manganese deposition on
the
shells of living molluscs", Nature, 185: 336-337 that described at
least the
black deposits on the tip of the scaphopod Dentalium entale containing
Manganese.

           Peggy Williams: shell collecting trips
          Visit my website: www.Shelltrips.com
                               PO Box 575
                        Tallevast FL 34270
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