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The solution will be supersaturated when salt crystals begin to collect on the bottom of the pan.
Two options for growing salt crystals:
Soak a piece of cardboard in the solution until it is saturated and sinks to the bottom of the pan. The cardboard will act as a template or base for crystal growth. Put the pan in a sunny location. Crystals will form as the water evaporates.
Simply place the pan of solution in a warm location, and allow crystals to grow without a template. Both methods work. The salt crystal will grow over several days.
Try several pans, and study how the growth of crystals varies between them.
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