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The traditional way of testing gypsum for fineness involves rubbing up with turpentine
Fineness Modulus is a measurement of the coarseness or fineness of a given aggregate.
i think the fineness is 583
It is used to measure the purity of gold alloys. One karat (or carat) is equal to 1/24 purity by mass.
Carats and fineness are both words relating to gems.