A short encyclopedia entry on indigo from the first edition of the Encyclopedia Britannica. It cross-references the botanical genus Indigofera, then describes how indigo blue is made from the leaves of the anil plant by steeping, churning with olive oil, settling and drying. It also gives advice on judging quality, compares East Indian (Serquisse) with West Indian (Guatimala, St Domingo, Jamaica) types, and lists uses for dyers, laundresses, painters and confectioners.