What is the White Coating on Chocolate?

Chocolate's white coating is termed "chocolate bloom". 

Two types exist: fat and sugar. 

How do they differ? 

Temperature variations and incorrect storage induce chocolate fat bloom.

Melting chocolate fat occurs at high temperatures.

 Fat becomes white when the temperature drops.

Humidity affects chocolate sugar blooming. 

High humidity dissolves sugar crystals, coating chocolate white. 

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