What is the natural waxy coating apples produce called?
Bloom
The natural, thin, waxy layer that apples inherently produce while growing is specifically referred to as the 'bloom.' This coating serves a crucial biological function; apples are composed mostly of water, ranging between 80 and 95 percent, and they continually lose this moisture through transpiration and respiration as they mature and after harvest. The bloom acts as a natural sealant, effectively trapping this essential internal moisture. By maintaining hydration levels, this natural wax layer ensures that the fruit retains its expected characteristics of crispness and firmness. Furthermore, this barrier provides initial protection by discouraging the penetration of external microorganisms, such as bacteria and mold, until the fruit is picked.

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