Sodium Chloride: Modification of Crystal Habit by Chemical Agents.
Microscopic investigation of drops of brine evaporating in air revealed crystal forms of sodium chloride other than the cube, when cysteine, creatinine, papain, monosodium glutamate, sodium hexametaphosphate, a combination of sodium hexametaphosphate and aluminum salt, or aluminon were added to the brine in small amounts. Some of these have a definite effect in parts per million concentration.
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