D01CCHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNINGCARBONISING RAGS TO RECOVER ANIMAL FIBRESAttention is drawn to the note following the title of Class D01 D01C1/00 D01C1/00Treatment of vegetable material D01C1/02by chemical methods to obtain bast fibres D01C1/04Bacteriological retting D01C3/00Treatment of animal material, e.g. chemical scouring of wool D01C3/02De-gumming silk D01C5/00Carbonising rags to recover animal fibres