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Lemon Test - The lemon test is to determine the ability of your granite to resist etching. Follow the steps below: 1  Place a wedge of lemon or lime, cut side down, on the sample overnight. 2  Wipe the sample in the morning and hold it at an angle to the light.  Check for a rough spot where the lemon was placed.
A simple definition is used in introductory courses; a more precise definition is used by petrologists (geologists who specialize in the study of rocks); and, the definition of granite expands wildly when used by people who sell decorative stone such as countertops, tile, and building veneer.