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Alternative forms[edit]


From Middle English coperas, coperose (metallic sulfate), from Anglo-Norman or Old French. Compare French couperose (sulfate), Medieval Latin cuprosa, Late Latin aqua cuprosa, Latin cupri rosa, "rose of copper".


copperas (usually uncountable, plural copperases)

  1. iron(II) sulfate.
    • 1707, John Mortimer, The whole Art of Husbandry, in the way of Managing and Improving of Land
      It were superfluous to describe the Process of making the Aqua fortis; it shall suffice to let you know, that our common Coperas makes this Aquafortis well enough for our purpose []
    • 1843, Thomas Carlyle, Past and Present, book 2, ch. 6, Monk Samson
      […] what a change has introduced itself everywhere into human affairs! How human affairs shall now circulate everywhere not healthy life-blood in them, but, as it were, a detestable copperas banker’s ink;


Further reading[edit]

  • copperas on
  • Copperas” in David Barthelmy, Webmineral Mineralogy Database[1], 1997–.
  • copperas”, in[2], Hudson Institute of Mineralogy, accessed 29 August 2016.