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Indigo Dyeing, a dreamful chemistry (7):
Yesterday I visited KAIHARA Co., Ltd on business, a leading manufacturing company of the brand-named denim fabric all over the world. ( I felt I could finally have visited a manufacturing company that has been representing Japan for a long time and could detect a good whiff of the textile industry. 
The picture shows the chemical formula of the indigo dye that becomes water-insoluble when oxidized to produce its color .