Run a roll of black and white film through some fixer solution (hypo).
It will disolve the silver-based film emulsion. If you know a
photographer who uses black and white film ask for a bottle of
exhausted fixer solution. You might even get some from a commerical,
custom film processor.
>
> I've mailed my chemicals shop 'bout the prices for silver chloride and
> silver nitrate and they put quite the dampener on the idea anyway.
While
> it is probably very sparingly used it is still not cheap. Also, the
layer
> is probably very, very thin. I guess it would be more economical if
one
> would use "junk" silver and convert it into silver chloride with
> electrodes or to silver nitrate with acid. I guess plumbing solder is
> really the most economical way.
>
> ST
>