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How does sodium chloride obtain its color?

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Sodium chloride has no colour. The individual crystals which make up a pile of salt are all transparent or translucent. However the pile appears white due to reflection and diffusion of ambient light. read more

"Rock salt" contains many impurities, in addition to its main ingredient, sodium chloride. Some trace chemicals in rock salt, such as lithium chloride or sodium carbonate, hold onto water, which might boil out, sizzling and popping, and if your specimen got hot enough, carbonates could decompose. read more

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