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The reduction of insoluble quinones to soluble hydroquinones and reoxidation in air to the quinone structure is the principle involved in dyeing cloth with"vat" dyes. 甕染燃料對佈料著色的原理在於不溶性醌類的還原和可溶性氫醌於空氣中被再氧化至醌類結搆。