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Filtering rock salt solution

Filtering rock salt solution

C026/6756

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Filtering impurities from rock salt. The natural rock salt has been ground and dissolved in warm water. All of the salt, sodium chloride, dissolves, leaving a suspension of mineral and organic impurities. These are filtered out in the filter funnel. The liquor that is collected is then evaporated leaving only the pure crystalline salt behind.

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