Abstract
Coloration of fibres by mass‐pigmentation and resin‐bonding techniques is becoming increasingly important. It is thus obviously desirable to be able to recognise and distinguish between materials coloured by these methods and those coloured conventionally. Such recognition is normally possible by observing pigment particles during examination of single fibres under the polarising microscope. Fibres coloured by conventional dyeing and printing methods generally appear uniforrnly coloured. Mass‐pigmented fibres show a uniform distribution of pigment particles, whereas resin‐bonded materials have an irregular distribution of particles on the fibre surface.

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