to finish the processing treatment the yarns thus obtained were knitted plain to obtain a protein base fiber material using the fabric of example 1 a pilling test using jis l1076 ici type test machine pilling resistance was evaluated a very excellent pilling resistance was obtained as shown in table 2 below a cheese roll of 500 g per one yarn of off scale wool yarns of 1 48 count subjected to a scouring treatment is mounted on a cheese dyeing machine for 1 kg test and water of room temperature is added to the treatment bath such that the bath ratio becomes 1 18 while circulating water in the treatment bath glycidyl methacrylate is added in an amount of 5 by weight to the weight of the fibers as a crosslinking agent by adding formic acid to the above described treating liquid the ph of the treating liquid is adjusted to 2 0 thereafter the treating liquid is circulated the temperature is gradually raised to 100 u00b0 c and the treating liquid is maintained at this temperature for 3 hours the ph at the end of the reaction is 2 0 after a slow cooling treatment the treating liquid is removed water washing is repeated three times and then hot water washing is carried out at 60 u00b0 c for 10 minutes thereafter water washing is carried out three times and a softening treatment is applied for 15 minutes at 45 u00b0 c to finish the treatment the yarns thus obtained were knitted.