zinc-greenhttp://www.oed.com/dictionary/zinc-green_n%3Ftab%3Dmeaning_and_usezinc green, n.
First published 1921; not fully revised

zinc greennoun

  1. 1847–
    A mixture of zinc and cobalt oxides used as a pigment.
    1. 1847
      Processes for manufacturing on a large scale zinc yellow..and zinc green.
      British Pat. 11,616 5
    2. 1973
      Much of the zinc yellow manufactured was mixed with Prussian blue to make various shades of a permanent zinc green.
      E. Lalor in T. C. Patton, Pigment Handbook vol. I. 850/1

Originally published as part of the entry for zinc, n.

zinc, n. was first published in 1921; not fully revised.