Abstract
The dyeing of wool yarn with dyes other than the level‐dyeing type has become important only since about 1950, but it is now possible to dye almost all colours fast to the S.D.C. No. 2 Washing Test (B.S. 2684) and yet sufficiently level for knitting in solid‐shade garments. The requirements of the various trades using fast‐dyed yarn are considered, and an outline is given of the developments in dyes and dyeing machines leading to the present‐day position. Advances have been made in dyes, dyeing machines, and dyeing methods, and these have been complementary. These aspects are discussed separately, and attention is drawn to complications which have arisen as a result of the adoption of new methods.
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