The most common is to brush a layer of sugar water or mirror pectin on the surface of the fruit, sugar water needs to be boiled beforehand according to the recipe, cooled and used, mirror pectin is common: Lady brand neutral mirror pectin, before using to blend into the 20% or so of the pure water diluted Ze a little bit, you can keep fresh oxidation, and increase the gloss. But it is still recommended to eat as early as possible, no matter how long it will not be fresh.