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How to separate salt and sugar
Assess the different grain sizes of salt and sugar.
At first glance, table salt and granulated sugar look very similar, including in size. The minute differences in the average grain sizes of the two, however, does provide an option for attempting separation.
Regular table salt has an average grain size of 100 microns, or 0.01 mm. Note that other types of household salt, such as kosher or pickling salt, will have widely divergent average grain sizes.