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What Are Pistachios? Pistachio is a dry fruit from the pistachio tree; a small tree with origins in the Middle East and Central Asia. The pistachio tree belongs to the cashew family. Their fruit is a drupe that contains an elongated seed; it is this seed that people eat. The seed is a culinary nut, rather than a botanical nut, and has a distinct flavour.
Best Answer: Originally the dye was applied by importers to hide stains on the shells caused when the nuts were picked by hand. However most pistachios are now picked by machine and the shells remain unstained, making dyeing unnecessary (except that some consumers have been led to expect colored pistachios).And the sky is blue because of the Rayleigh Effect.owever most pistachios are now picked by machine and the shells remain unstained, making dyeing unnecessary (except that some consumers have been led to expect colored pistachios). And the sky is blue because of the Rayleigh Effect.