Whitening stone

a sharpening and polishing stone used by cutlers; also, a finishing grindstone of fine texture.

See also: Whitening

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The '50s seem like a long time ago now...making tar babies on hot days, ollies and steelies, stalies, step whitening stones, reckitt's blue bags, dolly pegs and possers, dolly tubs - now a garden fashion statement - black-leading the kitchen range, coal cellars and our pre-war Austin Sixteen motor car with running boards had a pneumatic window wiper which we had electrified.