Separating salt from rock salt. Rock salt being separated from its impurities. Here, crushed rock salt has been added to warm water to dissolve the salt and filtered to remove any insoluble impurities. The solution is now being heated gently to evaporate off the water. This will leave the pure salt behind.

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TOP16629842

Source:

達志影像

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RM

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須由TPG 完整授權

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