Fragments of coal, or soil stained black with coal, will be found near the outcrop tif coal beds.
The alkaline titanate first produced is converted into crystalline fluotitanate, K 2 TiF 6, which is with difficulty soluble and is extracted with hot water and filtered off.
557.) Titanium fluoride, TiF 4, is a fuming colourless liquid boiling at 284°, obtained by distilling a mixture of titanium oxide, fluorspar and sulphuric acid; by heating barium titanofluoride, BaTiF6 (Emrich, Monats., 1904, 25, p. 907); and by the action of dry hydrofluoric acid on the chloride (Ruff and Plato, Ber., 1904, 37, p. 673).
By dissolving the dioxide in hydrofluoric acid a syrupy solution is obtained which probably contains titanofluoric acid, H 2 TiF 6.