The Collaborative International Dictionary of English v.0.48:

Sulphocyanate \Sul`pho*cy"a*nate\, n. (Chem.)
   A salt of sulphocyanic acid; -- also called thiocyanate,
   and formerly inaccurately sulphocyanide.
   [1913 Webster]

   Ferric sulphocyanate (Chem.), a dark red crystalline
      substance usually obtained in a blood-red solution, and
      recognized as a test for ferric iron.
      [1913 Webster]