Wool may be excited by both mid‐and near‐u.v. radiation, emitting fluorescence. The extent of visible fluorescence depends on the origin of the wool and the degree of weathering, (the tips of the fibres being more fluorescent than the roots) and chemical modification. In particular oxidative treatments such as chlorination of shrink‐resist procedures or peroxide bleaching processes increase the intensity of visible fluorescence but decrease the intensity of u.v. fluorescence (emission maximum at about 350 nm). It is proposed that the presence of these fluorescent chromophores in the fibre relates to the susceptibility of wool to yellow on exposure to light.
The fibre composition of a textile is a fundamental characteristic in determining the product's behaviour, end use and value. This paper reviews recent developments in the fields of fibre identification and blend analysis, several of which are extensions of more traditional methods. Difficulties and advantages associated with the techniques described are considered.
The uniformity of chlorination and I or polymer deposition in continuously shrink–resist–treated wool was assessed by using selected dyes and a fluorochrome, and examining stained fibres in cross–section under a tungsten lu. v. light microscope. The differing levels of staining between fibre sections within a sample provide an indication of the uniformity of treatment.
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