30—REFLECTANCE MEASUREMENTS ON SCOURED WOOL

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Abstract
The whiteness of scoured wool is an important selling point and is capable of being measured and included in a specification. An account is given in this paper of an investigation in which the following factors influencing the reflectance of loose wool were examined on an Elrepho Tristimulus Colorimeter, a specially constructed cell with a quartz-glass window being used: regain, fibre length, packing density, and sample thickness. Wools of different mean fibre diameters and grease contents were examined, and the effect of repeated measurement was also investigated. The results indicate that the precision of measurement is highest when cored or cut-up wool is used at a packing density of about 0.3 g/cm3 or more, with a sample thickness of at least 4.5 mm. The technique of repeated carding and measurement of the same small sample is not recommended as a method of improving precision.

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