Deodorization properties for ammonia (Am), acetic acid (Ac), and ethanethiol (Et) were studied by Tedlar bag and detection tube method for totally eighteen samples: six protein fibers of different origins, namely feather including down of water fowls, two scoured silks of different origins, natural wool, two kinds of descaled and crosslinked wools. In addition, samples were prepared by treating these fibers with Cu(II) (NO₃)₂ or duplicate mordanted with the copper salt and C. I. Mordant 3. Deodorizations with two kinds of activated carbons were measured as the reference.

By the measurements of their deodorization curves with 0.1 g of each sample, apparent initial rate constant of deodorization, k, and deodorization capacity, C, were estimated. It was found that k values of these samples were eventually larger than those of the references by 2 or 3 times, but C ranged 10 to 80％ of them. Ac was deodorized only by the feathers. For the deodorizations of Am and Et, the feathers were found to be most effective. In favorable cases, the two Cu(II) (NO₃)₂ treatments increased k and C values by several times.