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rottenstone

[ rot-n-stohn ]

noun

  1. a friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals.


rottenstone

/ ˈrɒtənˌstəʊn /

noun

  1. a much-weathered limestone, rich in silica: used in powdered form for polishing metal
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of rottenstone1

First recorded in 1670–80; rotten + stone
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Example Sentences

The sides were painted a rich brownish-red, which was lovingly hand-polished to a shiny gloss with oil and rottenstone.

From Time

I was kneeling on the other side of it, polishing the lock with an oily rag and rottenstone.

Tripoli and rottenstone are light, porous, siliceous rocks which have resulted from the leaching of calcareous materials from various siliceous limestones or calcareous cherts in the process of weathering.

The smoothing is done with a lead lap and fine emery, and the polishing may be accomplished by means of a lead lap, whose surface is hacked and supplied with rottenstone and water.

A "Paste" Metal Polish for Cleaning and Polishing Brass.—Oxalic acid 1 part, iron peroxide 15 parts, powdered rottenstone 20 parts, palm oil 60 parts, petrolatum 4 parts.

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rotten icerotten to the core