There are all sorts of stones/minerals that have various degrees
of hardness. There are charts to show this ranking, often used
to help identify minerals.
Diamond is at the top, nothing scratches diamond, while
things like clay or slate are at the bottom, almost everything
scratches them.
Pumice is also fairly soft, its one of the ingredients in
"Lava" soap. so I suppose short of finding a pumice stone, you
could try using a bar of "Lava" soap.
This scale of hardness is also often used for buffing and polishing
different materials. I think just below pumice is "rottenstone",
which was used to clean the wooden decks of ships.
Weird history trivia for the day.
On 03/29/2013 08:23 AM, Cindi Wass wrote:
>
>
> Thanks, I guess I used a hard surface pumice stone and scratched away --
> leaving marks behind. The idea of pulverized stone sounds good, or
> perhaps I used too hard of a stone? Appreciate the comments.
--
Dave Uebele (daveu@sptddog.com)
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