|This vat uses Sodium dithionite (hydrosulfite) and sodium hydroxide and is widely used at the present time|
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The zinc hydrosulfite vat
The hydrosulphite-soda vat has found but little application in Great Britain, though it is used to a considerable extent on the Continent. When made up with synthetic indigo, it is quite free from sediment, and with high-class natural indigo, the insoluble matters are trifling in amount. On this account the hydrosulphite-soda vat is peculiarly adapted for use in dyeing machines. When ordinary vats are used, there is also the advantage of smaller vessels being needed, on account of no space being required for a bulky sediment. Naturally, with the employment of caustic soda for wool-dyeing, the greatest care must be taken to avoid an excess.
The Badische Anilin- und Soda-Fabrik recommend the following proportions for a strong vat :
Capacity of vat, 220 gallons.
Edmund Knecht, Christopher Rawson, Richard Loewenthal, Manual of dyeing : for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing., 6th ed. (1920), London: Charles Griffin and company, limited; Vol. 1, p. 326
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