The most important component of the spinning bath in the Viscose process Sulphuric acid converts the alkali contained in the Viscose into sodium sulphate and separates the cellulose from the Viscose again Pure, concentrated sulphuric acid is an oily, heavy liquid, as clear as water The sulphuric acid used in spinning operations is colourless to weak yellowish, and clear to slightly cloudy It has a concentration of 95 - 96% and a specific gravity of 1 84 - 1 88 (weight of 1 44 - 1 88 kg/l)