The Interessengemeinschaft Farbenindustrie AG was a German chemical and pharmaceutical conglomerate formed in 1925. In China I.G. Farben marketed itself as 大德颜料厂 - "Big German Dye Factory". It's official Chinese distribution company, Deutsche Farbenhandelsgesellschaft Waibel & Co. aka DEFAG (德孚洋行), was founded in Shanghai on January 1, 1927.
Cut in the shape of a butterfly - "The cloth that never fades". The blue dye was discovered in 1901 by German chemical manufacturer BASF (later shareholder of the IG Farben conglomerate). BASF had been active in China since 1885 and Indanthrene dye immediately won great popularity among Chinese women who began to wear qipao dresses of such bright blue cotton fabric.