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Six cotton samples obtained from appropriate market sources were dyed with C. I. Direct Blue 200, a copper complex direct dye, and pre-and post-mordanted with Cu(II) sulfate. Dye and copper ion uptake, carboxylic acid contents and deodorization of ethyl mercaptan were measured for the samples appropriately treated. The uptake of the dye by four differently mordant-dyed specimens from a single cotton sample was the same to within ± 10%: the uptake by respective specimens was in the range 10—15 mg/g, except for that of a scoured and mercerized sample, which had uptake in the range of 20 mg/g. The copper ion uptake by pre-mordanted specimens was found not to be correlated with the carboxylic acid contents. It was inferred that the differences in the nature and the scouring treatment of the cotton sample were responsible for the unexpected copper ion uptake. The uptake was most enhanced by the successive pre-mordanting, dyeing, and post-mordanting treatment for all the six cotton samples. The uptake of dyed and post-mordanted samples came next and the rest of the treatments showed that uptake varied within three times the copper ion uptake. The deodorizing abilities of ethyl mercaptan by the dyed and mordanted cotton specimens were compared. It was found that the deodorization rates can be classified into three groups, one group almost null, the second one intermediate and the third one fast in comparison with activated carbon. All the deodorization effects plotted against the copper ion uptakes were found to increase quadratically with the copper ion uptake, regardless of the dyeing and mordanting conditions.

Cotton fabric with a deodorizing function is prepared by mordant dyeing with direct dyes containing copper ions and copper(II) nitrate. The effects of pre- and after-mordant ings and after-treatment with copper(II) nitrate are examined for C.I. Direct Violet 47 and C.I. Direct Black 112. The copper ion uptake of cotton dyed with pre- and after mordantings is about 1/10 the value for wool samples. The elimination of ethyl mercaptan from air by the mordant dyed fabrics is measured in a Teddler bag. Untreated cotton fabric shows no deodorizing ability, but each of the pre-mordanted, dyed, after-mordanted, and after-treated fabrics shows a considerable deodorizing ability. The effects of after mordanting and after-treatment are particularly notable, implying that they are caused by dye-copper ion complexes.

Wool fabrics with a deodorant function are prepared by acid mordant dyeing with copper(II) nitrate. The effects of pre- and after-mordanting are examined for C.I. Mordant Yellow 3 and C.I. Mordant Red 17. Carboxylate groups in the wool fibers and the dyes work to fix copper ion with the deodorant ability against mercaptan. The elimination of mercaptan from the air by the mordant dyed fabrics is measured in a Teddler bag. Fabrics untreated or dyed without mordanting show no deodorant ability, but those pre-mordanted or pre- and after-mordanted show considerable deodorant ability. By controlling the pH of the dyebath to about 4, dye and copper ion uptake of the fabric is optimized and the deodorant ability is also optimum.