citrine ointment

from The Collaborative International Dictionary of English v.0.48

Citrine \Cit"rine\, a. [F. citrin. See {Citron}.]
   Like a citron or lemon; of a lemon color; greenish yellow.
   [1913 Webster]

   {Citrine ointment} (Med.), a yellowish mercurial ointment,
      the {unguentum hydrargyri nitratis}.
      [1913 Webster]