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Why is the nut’s skin white?

Pistachio is a dried fruit that looks a bit like a ginkgo, but it is different from a ginkgo because it is often cracked and cracked. Pistachio is the fruit of pistachio of the genus Pistacia of the Anacardiaceae family, and its Latin scientific name should be Pistacia vera. This species was published by the Swedish botanist Linnaeus in 1753 in his book Flora Species. This species was included in Flora of China. According to records, the morphological characteristics of this species are a small tree, 5 to 7 meters high, with odd-numbered pinnate compound leaves, with 3 to 5 leaflets, but often 3. The leaflets are ovate or broadly elliptical, 4 to 10 cm long, 2.5 to 6.5 cm wide, and entire. Panicles are 4 to 10 cm long. Dioecious, the male flowers have 3 to 5 tepals, varying in size. Female flowers have 3-5 tepals, membranous. The ovary is oval, and the fruit is larger, oblong, about 2 cm long and 1 cm wide. The apex is sharp and turns yellow-green or pink when ripe.