The Gravimetric Estimation of Medulla in Wool

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Abstract
A gravimetric estimation of the amount of medulla in wool can be made by determining the amount of residue left after samples of known dry weight have been treated with a 1.6% solution of peracetic acid for 48 hr. at 25° C, followed by a 1.0 N solution of am monia for 24 hr. at 25° C. A correction must be applied for the amount of residue given by nonmedullated wools, which is approximately the same for Merino and crossbred wools. Samples which are to be used for analysts should not be dried at a high tempera ture before use. because the amount of residue increases with increasing temperature of drying, especially when the moisture content of the wool is high, owing to the formation of resistant cross-linkages between the peptide chains.