Is Your White-Coated Chocolate Safe to Eat? Understanding Fat and Sugar Bloom
Sometimes, you might notice that the chocolate you've taken out of the fridge has a stark white appearance, leading you to believe that it has gone bad. In reality, this whitening is generally a harmless phenomenon. This white layer on the chocolate is referred to as 'bloom,' and it comes in two distinct types.
Chocolate blooming essentially occurs in two forms: fat blooming and sugar blooming.
According to research conducted by Richard Hartel, a professor of food science at the University of Wisconsin-Madison, this phenomenon arises from physical changes during the production and storage process of chocolate.
This occurrence, known as fat bloom, emerges when there's a modification in the crystal structure of the cocoa butter within the chocolate. Temperature fluctuations compel the cocoa butter to recrystallize, during which the fat molecules migrate towards the surface of the chocolate. This process is particularly accelerated by temperature changes between 20 to 25 degrees. The cocoa butter crystals that reach the surface reflect light differently, thereby creating a white appearance.
Can Sugar and Moisture Also Cause Flowering?
Sugar blooming is associated with the factor of humidity. When chocolate is left in humid environments, the sugar crystals on the surface attract the moisture and dissolve. As the moisture disappears, the sugar recrystallizes, but this time forming larger and irregular crystals. These large sugar crystals scatter light, creating a whitish appearance.
According to food technology research, the risk of sugar blooming significantly increases when chocolate is exposed to a humidity level of over 65%. Consequently, it is generally recommended to store chocolate in dry and cool environments.
Is Whitened Chocolate Harmful?
Bloomed chocolate is entirely safe and edible. As indicated in Hartel's studies, bloom merely creates an aesthetic deterioration, without affecting its nutritional value or safety. The only difference manifests in the texture and appearance - the chocolate might become slightly more brittle and lose its shine.
However, you might notice a subtle change in taste. In chocolates with fat bloom, the accumulation of cocoa fat on the surface can create a different sensation in the mouth. In the case of sugar bloom, the growth of sugar crystals might make the chocolate feel a bit more grainy.
To prevent your chocolate from blooming, it's sufficient to store it in a dry environment at a constant temperature between 15 and 18 degrees Celsius. This way, both the cocoa fat and sugar crystals will remain stable, and your chocolate will retain its original appearance for a long time.
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