CoCl2

from The Collaborative International Dictionary of English v.0.48
phosgene \phos"gene\ (f[o^]s"j[=e]n or f[o^]z"j[=e]n), n.
   (Chem.)
   A reactive chemical substance ({COCl2}), also called
   {carbonyl choride}, used in synthesis of numerous substances.
   In the First World War it was also used as a poisonous gas in
   combat.
   [PJC]
from The Collaborative International Dictionary of English v.0.48
Carbonyl \Car"bon*yl\, n. [Carbon + -yl.] (Chem.)
   The radical ({=CO}), occuring, always combined, in many
   compounds, as the aldehydes, the ketones, urea, carbonyl
   chloride, etc.
   [1913 Webster]

   Note: Though denoted by a formula identical with that of
         carbon monoxide, it is chemically distinct, as carbon
         seems to be divalent in carbon monoxide, but
         tetravalent in carbonyl compounds.
         [1913 Webster]

   {Carbonyl chloride} (Chem.), a colorless gas, {COCl2}, of
      offensive odor, and easily condensable to liquid. It is
      formed from chlorine and carbon monoxide, under the
      influence of light, and hence has been called {phosgene},
      or {phosgene gas}; -- called also {carbon oxychloride}. It
      is used in chemical synthesis, and was also used as a
      poison gas in World War I.
      [1913 Webster +PJC]
from The Collaborative International Dictionary of English v.0.48
Cobaltous \Co*balt"ous\, a. (Chem.)
   Pertaining to, derived from, or containing, cobalt; -- said
   esp. of cobalt compounds in which the metal has its lower
   valence.
   [1913 Webster]

   {Cobaltous chloride}, a crystalline compound, {CoCl2}, of a
      pale rose color when hydrous, blue when dehydrated. Its
      solution is used for a sympathetic ink, the writing being
      nearly colorless when dried in the air, owing to absorbed
      moisture, and becoming bright blue when warmed.
      [1913 Webster]
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