Arkansas stone

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Ar·kan·sas stone

A stone used for sharpening and grinding metals, especially the metal blades of knives.
References in periodicals archive ?
During her early years of nursing the nurse had to sharpen needles on an Arkansas stone.
After using the India stones which are basically for steel removal, I use a fine Arkansas stone or sometimes a ceramic stone to polish the new sear surface.
The Arkansas stone removes very little material, but brings the surface to a precise, smooth finish.
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