SnCl4

Fuming \Fum"ing\, a.
   Producing fumes, or vapors.
   [1913 Webster]

   {Cadet's fuming liquid} (Chem.), alkarsin.

   {Fuming liquor of Libavius} (Old Chem.), stannic chloride;
      the chloride of tin, {SnCl4}, forming a colorless, mobile
      liquid which fumes in the air. Mixed with water it
      solidifies to the so-called butter of tin.

   {Fuming sulphuric acid}. (Chem.) Same as {Disulphuric acid},
      uder {Disulphuric}.
      [1913 Webster]
    

Stannic \Stan"nic\ (-n[i^]k), a. [L. stannum tin: cf. F.
   stannique.] (Chem.)
   Of or pertaining to tin; derived from or containing tin;
   specifically, designating those compounds in which the
   element has a higher valence as contrasted with {stannous}
   compounds.
   [1913 Webster]

   {Stannic acid}.
   (a) A hypothetical substance, {Sn(OH)4}, analogous to silicic
       acid, and called also {normal stannic acid}.
   (b) Metastannic acid.

   {Stannic chloride}, a thin, colorless, fuming liquid,
      {SnCl4}, used as a mordant in calico printing and dyeing;
      -- formerly called {spirit of tin}, or {fuming liquor of
      Libavius}.

   {Stannic oxide}, tin oxide, {SnO2}, produced artificially as
      a white amorphous powder, and occurring naturally in the
      mineral cassiterite. It is used in the manufacture of
      white enamels, and, under the name of {putty powder}, for
      polishing glass, etc.
      [1913 Webster]