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PAINTING THE ORANGE
Today the orange is universally recognized as a rich source of vitamin C and therefore a desirable fruit for children. The natural color and other characteristics of the rind vary with different varieties and with the season. Once these features served to some extent as marks of identification. This is not true today, when there is current a tendency to "improve on nature." The inherent color of the rind of certain varieties of the orange is not an index of maturity of the fruit or of the degree of sweetness of the juice. Green pigment persists in the skin of mature fruit of high quality. Many growers apparently believe that the presence of chlorophyll in the pericarp impairs the marketability of the fruit. Several years ago the practice of exposing oranges to ethylene gas for from two to four days was introduced. The ethylene causes a blanching
Current Comment. JAMA. 1936;107(26):2136-2137. doi:10.1001/jama.1936.02770520038015