I have found that WD-40 works just as well, if not better, than silicon
oil.  It is much easier to find, and not so concentrated.  Use the straw
that comes with the can to spray some in the cap.  I then add cigarette
lighter fluid (also easy to find) to thin it, and to act as a carrier to
penetrate the shell.
 
Sylvia Edwards
 
Edward T. Schelling wrote:
<snip>
> fresh-taken specimens I get!  If you know anything about "Golden", they tend
> to fade quickly!  If you can't find any liquid silicon, you can make your
> own...you can get silicon grease from most auto parts stores, then  you can
> use acetone or some other thinner to turn it into a liquid state.  give it a
> try
>           Sincerely,
>            Ed [Schelling]