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Oranges and Lemons are often coated with an edible Johnson"s Wax. This is to replace natural wax lost when the fruit is cleaned with soapy water and fibre brushes, and the dried with hot air and foam rubber squeegees. Without surface wax, citrus fruit tends to shrivel.
Adding the wax is harmless, though if too much is applied, the fruit, which ordinarily breathes for a month or so after picking, will suffocate and lose some of its taste.