蚕在开始结茧时吐出的松乱丝缕，起固定结茧位置的作用。茧衣的纤维细而脆弱，并含有多量丝胶，不宜缫制生丝，但可用作绢纺原料。
husks ; blaze ; frison ; watt silk ; cocoon outer floss ; floss of cocoon
茧衣在酸性条件下含有大量正电荷，对阴离子染料具有很好的吸附作用。
Cocoon floss contains lots of positive charges in acid solution, so it can adsorb anion dye at acid condition theoretically.
丝胶是一种在茧衣中提取出来的蛋白质，由18种氨基酸组成，应用范围非常广泛，有“贵族蛋白质”之称。
Sericin, which has very wide applications, and is called to be "noble protein", consists of 18 kinds of amino acid.
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