Mark Johnson gave one to me over ten years ago he treated wtih mineral oil and the periostracum is still very much intact. A ltittle oily to handle the shell, but gorgeous preservation.
I will have this shell and other NC shells on display soon at Cape Fear Museum.

John Timmerman
Wilmington, North Carolina
>
> From: David Kirsh <[log in to unmask]>
> Date: 2007/08/19 Sun PM 07:46:34 EDT
> To: [log in to unmask]
> Subject: Re: [CONCH-L] periostracum question
>
> Hey congratulations, Vicky! Did you find it in North Carolina? That's where I found my live Cymatium parthenopeum about seven years ago.
>
> I believe I used a combination of mineral oil and paint thinner on the periostracum and it's still intact.
>
> David Kirsh
> Durham, NC
>
> -----Original Message-----
> >From: Vicky Wall <[log in to unmask]>
> >Sent: Aug 19, 2007 5:43 PM
> >To: [log in to unmask]
> >Subject: [CONCH-L] periostracum question
> >
> >
> >
> >Hi Everyone,
> >
> >I found a hairy triton this weekend and need advice on how to preserve the periostracum. The shell also has some animal still stuck that I can't get out. I have put hydrogen peroxide in the opening carefully as to not hurt the peri and tried flushing out the aperture but no luck yet.

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------