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What to look for in a knife sharpening stone/whetstone
Grit
Whetstones are measured in grit levels, which is the coarseness of the stone. Serena Poon, a celebrity chef, nutritionist, and Reiki master explains: “Coarse whetstones, which are generally categorized as up to about 1000-grit are useful for repairing damaged knives. Medium whetstones have about a 1,000-3,000-grit and are used to sharpen dull knives—this is likely the coarseness that you would use most at home. Finishing stones, or anything above 3,000-grit are used to polish and refine the blade.” Kajale recommends having a set that includes 400,1,000, 3,000, and 6,000-grit so you have a range you can use whether you’re setting or polishing your blade.