Blowroom waste of cotton spinning served as model substance for lignin
containing impurities of cotton. This substance consumed twice as muc
h caustic soda in alkaline scouring as raw cotton. The role of caustic
concentration is neglibile, that of the temperature of the scouring l
iquor is detectable in the removal of the impurities. The addition of
selected auxiliary chemicals of the scouring liquor strongly promoted
degradation and removal of the impurities.