Colour Fastness under the Perspiration Conditions of Naturally Dyed Cotton

Abstract

Naturally dyed cotton is a cotton with changed genetic characteristics. It is grown in four colours (yellowish brown, black brown, green, ivory). The basic characteristics of the red-brown cotton Coyote brown and the green cotton Paolo verde, both from South Carolina, were ascertained. Colour fastness under the conditions of perspiration was examined, and the changes were measured on the DATACOLOR DC 3890 instrument. The measurements revealed that the mentioned cottons are thin-walled and that Coyote brown belongs to the group of short fibres, while Paolo verde to the group of medium length fibres. The examination of colour fastness to perspiration points to the change of colour of both cottons. Blue tint is intensified by the alkaline treatment and yellow tint by the acid treatment. The achieved changes of colour on the samples are shown by the total change of colour (dE) and described qualitatively. It has been concluded that Coyote brown cotton is a more successful variety than Paolo verde.