Definition of rottenstone in English:
 rottenstone
noun ˈrɒt(ə)nstəʊnˈrɑtnˌstoʊn
mass nounDecomposed siliceous limestone used as a powder or paste for polishing metals.
 Example sentencesExamples
-  For older stains use a paste of rottenstone, baking soda or cigarette ashes mixed with mineral oil, linseed oil, or lemon oil.
 -  For a glassy finish, use pumice or rottenstone (decomposed limestone).
 -  Using rottenstone will produce the finest mirror-like finish.
 -  For the final touch, rub down the table using a thin paste of rottenstone.
 -  Of course there's sanding between coats and a final rub out with pumice or rottenstone to give an even ‘dead’ surface.
 
  Definition of rottenstone in US English:
 rottenstone
nounˈrɑtnˌstoʊnˈrätnˌstōn
Weathered siliceous limestone used as a powder or paste for polishing metals.
 Example sentencesExamples
-  For the final touch, rub down the table using a thin paste of rottenstone.
 -  Of course there's sanding between coats and a final rub out with pumice or rottenstone to give an even ‘dead’ surface.
 -  For a glassy finish, use pumice or rottenstone (decomposed limestone).
 -  For older stains use a paste of rottenstone, baking soda or cigarette ashes mixed with mineral oil, linseed oil, or lemon oil.
 -  Using rottenstone will produce the finest mirror-like finish.