The Dyeing of Cotton And Other Vegetable Fibres With the Dyestuffs of Leopold Cassella & Co. Frankfort O. M
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sodium sulphide 16—20 ,, Immedial Blue. For continuing in the same bath, add : 1 ! /2 — 2 °/o caustic soda lye 75° Tw. 6 — 8 °/o cryst. sodium sulphide 8— 12°/o Immedial Blue. The warps are dyed one hour at the boil, the liquor being drawn by vacuum and returned by steam pressure. After dyeing, the beam is lifted and the adhering liquor drawn off it, first by vacuum and then by air pressure, so that it may retain as little dye-liquor as possible. The steaming of the warps is also done on the be...am, and the admission of both steam and air (by means of the injector) is so arranged that both enter direct into the central cavity of the beam and penetrate the warp thoroughly with the aid of sufficient pressure. The Dyeing of Cotton Warps. 307 If the warps be too bulky, and should thus make penetration difficult, it is advisable to place the whole beam in a small well covered box and to blow the steam both into the interior of the beam and also into the steam-box. Combination of Immedial Blue or Immedial Direct Blue with Indigo on Cotton Warps.
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