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They are grown in Agar, as opposed to water (or any aqueous solution) because if the metal is grown quickly, as it would be in water, the crystals that are formed are hard to see, and their shape is usually undefined. However when they're grown in Agar jelly, the process is significantly slowed down, and after 1-2 days when you observe it, the crystals are usually larger and the shape can be clearly made out (providing you did the experiment right).

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Q: Why are metal crystals grown in agar rather than in a liquid?
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