Mordanting of wool with salts of aluminum

A comparison of the aluminum-chloride and sulfuric-acid methods for the quantitative estimation of wool in cellulosic admixtures has been made by determining their effects on the weight, ash, total sulfur, and sulfate sulfur of wool.; Change in weight of wool by the aluminum-chloride method varied from -2.1 to +1.9 percent for 32 determinations which averaged -0.2 +/- 0.9 percent; for five sets of six parallel determinations the means ranged from -1.2 to +1.0 percent. Change in weight of wool by the sulfuric-acid method varied from -0.6 to +2.4 percent and averaged +0.9 +/- 0.6 percent for nineteen determinations; for three sets of six parallel determinations the means ranged from 0.4 to 1.4 percent.; The sulfate sulfur, 0.30 +/- 0.01 percent, was removed by the aluminum-chloride method and increased to 1.51 +/- 0.08 percent by the sulfuric-acid method. The total sulfur, 3.76 +/- 0.01 percent, decreased to 3.45 +/- 0.04 percent with the aluminum-chloride method and increased to 4.93 +/- 0.14 percent with the change in sulfate sulfur.; The ash, 0.10 +/- 0.01 percent, increased to 0.43 +/- 0.15 percent for one set and to 1.04 +/- 0.11 percent for another set of six parallel determinations with the aluminum-chloride method, and decreased to 0.05 +/- 0.01 percent with the sulfuric-acid method.; With the proportion of wool at a maximum these data show that the 70 percent sulfuric-acid method is somewhat better than the aluminum-chloride method for the estimation of wool.