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Posted in response to Old Polish from Alan Perryman on July 07, 2010 at 10:22:10:

Re: Old Polish

Hi Alan,

To the best of my knowledge, cerium and tin oxide are stable compounds that should have an indefinite shelf life and do not degrade or deteriorate with time. I've used cerium that was at least 10 years old for polishing faceted stones as well as cabs without issues. I can't say from personal experience regarding 40+ years old, but I yours is the first report I've encountered about old polish not working.

I assume you are referring to previously unused powder. Cerium and tin oxide do break down mechanically and lose their effectiveness as polishing agents with use.

From Bob Keller - July 08, 2010 at 23:30:30

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Message Index Start New Topic Photo Gallery FAQ and Use Tips Bob's Rock Shop

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