From London's Ghost Acres

A dye, used to create black Morocco leather (Yeats 1878, 297).

Indigo is predominately used as a colouring agent (, and in the Pharmacopeia it is used to produce a test solution, and is not used directly in any medicines.

British Pharmacopoeia 1867


“A blue pigment prepared from various species of Indigofera.”[1]

Preparations of Indigo

Solution of Sulphate of Indigo (test solution) [2]

  • indigo, dry and in fine powder (5 grains), sulphuric acid (10 fl oz)


  1. General Medical Council of Great Britain, British Pharmacopeia, (London: Spottiswoode & Co.,1867), 381
  2. GMCGB, 390

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Used to Make