rottenstone
/rot-n-stohn/US // ˈrɒt nˌstoʊn //UK // (ˈrɒtənˌstəʊn) //
烂石,烂石头,腐石,烂石子
Definitions
n.名词 noun
- 1
- : a friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals.
Examples
The unpainted surfaces will be kept clean and bright with rottenstone and oil or "Putz-pomade."
Polishing is effected by wooden wheels fed with wet pumice-powder and rottenstone and by brushes fed with moistened putty-powder.
Tripoli (and rottenstone) are used in polishing powders and scouring soaps as well as for filter blocks and many other purposes.
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