Abstract
A method is described in which protein fibres, natural or artificial, present in a mixture with non-protein fibres, are dissolved by means of alkaline sodium hypochlorite solution, and the residual non-protein fibres are collected and weighed. No other fibres, with the exceptions of raw cotton and cellulose acetate, lose appreciably in weight in the reagent under the prescribed conditions. Raw cotton loses about 3 per cent of its weight in the solvent, and this loss can be allowed for by the use of a correction factor. The method is not recommended for mixtures containing cellulose acetate. The accuracy of the method is demonstrated by analyses of a large number of laboratory-prepared mixtures and spun blends.
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