This test methods provides a simple testing procedure to evaluate the effect of acid cellulase enzymes on cellulosics by laundering. 2. Principle 2.1 This test method determines the reaction of cellulosic fabrics to treatment with acid cellulase enzymes. Such treatment usually result in improvements in the hand, drape, fuzz and pill appearance of cellulosic fabrics together with the removal of linters and immature/dead cotton fibers. The agitation in the washer simulates the action in rotary drum machines, paddle machines and jets.