Hi Beth
Try to use a mixture of 50% alcohol and 50% of glicerine. It works on
cymatium.
Karin
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> Does anyone have a suggestion for preserving the black periostracum on
> bivalves like Modiolus modiolus? From what has been said earlier I
gather
> that with a mixture of patience and mineral oil I could remove the
> periostracum but some how the shell doesn't look "right" without it. Any
> suggestions?