Abstract
The dyer's method of specifying colours in terms of "shade", "strength" and "dullness" is described and compared with the monochromatic system of colorimetry. Experimental evidence indicates that shade is probably equivalent to dominant hue in all respects. Differences of shade expressed by the dyer in a quasi-quantitative manner are shown to be related to just-perceptible steps of hue as determined by Wright. Changes in strength and dullness both involve simultaneous changes in purity and lightness (brightness factor), but statistical treatment of the result of an examination of dulled patterns by trained colourists and non-colourists shows that the former are guided by the physical quality of purity and the latter by lightness in assessing strength.
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