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  • A human body is consumed by a furnace; a woman holds a small red limbless effigy bearing a crown; a man holds a sheaf, and another a stick; below, by another furnace, a green and red dragon face each other, poised for combat; representing a stage in the process of alchemy. Coloured etching, ca. 18th century.
  • Optics: spectra of various gases. Colour aquatint by R.H. Digeon, ca. 1883.
  • A black sun with a face descends behind the horizon of a marshy landscape; representing the state of putrefaction in alchemy. Watercolour painting by E.A. Ibbs.
  • An eye in a star, the spokes of which divide the spectrum of colours; putti hold a prism, a telescope, a rod refracted in water, and a camera obscura; representing optics. Engraving by J. Chapman, 1820, after A.D. Macquin.
  • Optics: colour scales for violet and yellow. Colour mezzotint [?] by R.H. Digeon, ca. 1868, after J. Silbermann.
  • A red-faced king stands in a red robe, flanked by a queen and the deity Mercury in green clothes; representing a stage in the process of alchemy. Coloured etching, ca. 18th century.
  • Men vainly seeking alchemical 'white' (mercurial) water in the ground and in trees. Coloured etching after etching, ca. 17th century.
  • Optics: a soap bubble exhibiting interference colours. Colour mezzotint (?) by M. Rapine, c. 1883, after B. Desgoffe.
  • The Hermetic androgyne; representing the stages of the alchemical Work in One. Watercolour painting by E.A. Ibbs.