>     And, oh yes, the same acid can be used to remove discolorations on dentures. Same careful proceedure.
>      Art

It's advisable to remove the dentures from your mouth first.

Any acid can dissolve shell and calcareous deposits on the shell.  Vinegar is probably easier to obtain than most other options, and being a little weaker than some may be easier to work with.  The difficulty is trying to ensure that only the part you don't want gets dissolved.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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