How does the sugar layer coat on M&M chocolates?

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How does the sugar layer coat on M&M chocolates?

In: Chemistry

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They put the small drops of solid chocolate into a machine that resembles a small cement mixer. Said tumbler contains the sugar coating in a warm/hot liquid state, and it slowly builds up on the solid chocolate pieces.

The thickness of the coating is controlled simply by time. They leave them in the machine for a precise amount of time to get the desired result. The shape is controlled entirely by the shape of the piece of chocolate.