The density and sorptive capacity of some samples of cotton, silk and wool: Part III. Determinations on egyptian cotton

For mercerised cotton, undyed and dyed with a substantive dye, the true densities in helium and the apparent densities in benzene, water, air and hydrogen are given in this paper. The conclusion is reached that in cotton dyed with a substantive dye, the dye is bound intermicellarly, without changing the cotton substance. Hydrogen as well as air are adsorbed by cotton; the quantities adsorbed are not altered by the dyeing process. The opinion of Campbell and Russell that the true density of cotton will be found in water and not in helium, is disputed. Some remarks are made on the dyeing processes of cotton, silk and wool with direct dyes.