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橙红色的红薯被晾成干后，表面往往会泛出来一层“白”。这层白色物质是什么呢？这层白色物质不是灰尘，而是“糖”霜。红薯在晾干过程中，随着水分渗出蒸发，里面的糖分向外表析出，产生结晶，逐渐累积在表皮，在接触到空气后，形成一层类似白霜的物质。除了红薯，柿子晾干成为柿饼后，表面也有一层白霜。
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