“…Hixson and Stetkewicz (6) attacked the problem by measuring refractive index, dispersion, density, and viscosity of a large number of titanium sulfate solutions in which the molar ratio of sulfur trioxide to titanium oxide varied from 1.001 to 3.004, and the per cent titanium oxide from 0.5 to 26%. The data were then plotted against titanium oxide concentration in the hope that irregularities in the curve might be correlated with the peculiarities in the precipitation curves.…”