Investigation of wool samples after various times of treatment with concentrated sulphurio acid has shown that hydrolysable sulphate increases to a maximum after 1 hr, A fall in sulphate after 1 day to a relatively constant value corresponds to the loss of a scaly membrane. A slow increase in total sulphur is due to removal of the low‐oystine‐containing fraction of the fibre and to slow benzene‐ring sulphonation. Hydrolysates of wool treated with sulphurio acid contain substances identical with those produced on sulphonation of amino acids. Histological changes observed microscopically agree with the results of chemical analysis.
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Elliott et al. (1958) studied this question.
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