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Now I had to look up rottenstone and then Tripoli.......:rofl2:

I think you are right.

I got that info from their website. Bon Ami

They say the limestone is in it for a mild abrasive

I read a little about this also. There are so many interesting things and I have sometimes been accused about going off topic!:shrug::rofl2:

Now I had to look up the ingredients of Bon Ami!

More Feldspar [6.5 MOHs] than limestone [Calcium Carbonate at 3 MOHs]

Many other ingredients including Xanthan gum and citric acid....

Put...

I have read this thread with interest but have refrained from posting until today.

At work we have this "new" guy that seems to know it all and wanted to spend a lot of money to repair drinking...