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52 results
  • Sildenafil, the active ingredient in Viagra
  • Butterfly wing scales
  • Kidney stone crystals
  • Chemistry: geometric representations of crystalline substances. Coloured engraving by J. Pass, 1802, after C. Hauy.
  • Kidney stone, SEM
  • Chemistry: various crystalline substances. Coloured engraving.
  • Crystals of malic acid, an intermediate in the TCA cycle. This chemical occurs naturally in certain foods giving them a tart flavour and when added to food it is labelled as E296.
  • Dried buffer crystals, LM
  • Sildenafil, the active ingredient in Viagra
  • Tartaric acid crystals
  • Glucose
  • Crytals of Ascorbic acid
  • Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.
  • Human saliva displaying ferning. During the fertile phase of a woman's menstrual cycle an oestrogen surge causes salt crystals to appear in the saliva. When viewed under the microscope the crystalline salt structure resembles fern leaves and can be used as an indication of a woman's increased chances of conceiving at this time.
  • Folic acid
  • Chemistry: various crystalline salts. Engraving by Prevost after L.J. Goussier.
  • Salicin crystals
  • Chemistry: various crystalline substances. Coloured engraving.
  • Kidney Stone crystals
  • Geology: various crystalline substances. Coloured lithograph by A. Pralon after G. Pouchet.
  • Painting personified with its ancillary arts and sciences: optics, chemistry and mineralogy. Engraving by P.C. Baquoy, 1809, after J.M. Moreau.
  • Chemistry: various crystalline substances. Coloured engraving.