blue bice

from The Collaborative International Dictionary of English v.0.48

Bice \Bice\, Bise \Bise\, n. [F. bis, akin to It. bigio light
   gray, tawny.] (Paint.)
   A pale blue pigment, prepared from the native blue carbonate
   of copper, or from smalt; -- called also {blue bice}.
   [1913 Webster]

   {Green bice} is prepared from the blue, by adding yellow
      orpiment, or by grinding down the green carbonate of
      copper. --Cooley. --Brande & C.
      [1913 Webster]