The dyeing of textile fabrics . rmer is moregenerally employed. In recent years that excellentbleaching agent, hydrogen dioxide, has become an articleof commerce, and no doubt would be more largely used inwoollen bleaching than it is at present, if only it wereless costly. Gas Bleaching^ Stoving, or Sulphuring.—Yarn is firstscoured and well washed, then suspended on poles and placedin the sulphur stove—a spacious brick chamber which canbe charged with sulphur dioxide. The necessary amount ofsulphur (in the proportion of 6—8 per cent, of the wool tobe bleached) is placed in an iron pot in one c
The dyeing of textile fabrics . rmer is moregenerally employed. In recent years that excellentbleaching agent, hydrogen dioxide, has become an articleof commerce, and no doubt would be more largely used inwoollen bleaching than it is at present, if only it wereless costly. Gas Bleaching^ Stoving, or Sulphuring.—Yarn is firstscoured and well washed, then suspended on poles and placedin the sulphur stove—a spacious brick chamber which canbe charged with sulphur dioxide. The necessary amount ofsulphur (in the proportion of 6—8 per cent, of the wool tobe bleached) is placed in an iron pot in one corner of the Chap. VII.] WOOLLEN CLOTH BLEACHING. 113 chamber, and ignited by inserting a hot iron ; the chamberis then closed, and the moist yarn is left exposed to theaction of the gas for six to eight hours, or even over-night. Afterwards the chamber is thoroughly ventilated;the yarn is removed and well washed in water. Heavy woollen cloth, such as blanketing, is treatedin exactly the same manner as yarn, but with thin. Fig. 39.—Sulpliur Stove for Woolleu Cloth Bleaching. material—, merino, ifec.—the operation is preferablymade continuous, by adopting the arrangement of stoveshown in Fig. 39. It is provided internally with awooden frame, having rollers above and below. Theroof should be lined with lead, and heated with steampipes, in order to prevent condensation. The stove ischarged with sulphur dioxide as already described, or,preferably, the sulphur is burnt in a separate furnace,and the gaseous product is led underneath the perforatedtile floor of the stove. The cloth is introduced througha narrow slit in the wall; it then passes, as indicated 114 DYEIXG OP TEXTILE FABRICS. IChap. VII. under and over the rollers, and passes out again by thesame opening. The number of times the cloth is passedthrough the stove varies according to the appearance ofthe clotL In liquid hUaching, the woollen material is workedand steeped for several houre either in a solution
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