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Updated: May 20, 2025
Here there is thus one element more than in the vegetable fibres previously referred to, namely, nitrogen; and this nitrogen is contained in all the animal fibres. The outer envelope of silk-glue or sericin can be dissolved off the inner fibroïn fibre by means of hot water, or warm water with a little soap.
In the silk fibre there are two distinct parts: first, the central portion, or, as we may regard it, the true fibre, chemically termed fibroïn; and secondly, an envelope composed of a substance or substances, chemically termed sericin, and often "silk-glue" or "silk-gum." Both the latter and fibroïn are composed of carbon, hydrogen, nitrogen, and oxygen.
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