适用于任何形式的所有羊毛织物，即松散纤维、粗纱、纱线或布料。染料存在时可能会干扰比色测量。该方法不适用于氧化或还原羊毛。主要适用于未经还原或氧化的水洗羊毛、上衣、纱线或衣物中半胱氨酸和半胱氨酸的测定。

Applicable to all-wool textiles in any form, namely loose fibre, roving, yarn or cloth. Dyes when present may interfere with the colorimetric measurement. The method is not applicable to oxidized or reduced wool. It is primarily applicable to determination of cystine and cysteine in washed wool, tops, yarns or cloths that have not been reduced or oxidized.