Volume 1

Elements of the art of dyeing. With a description of the art of bleaching by oxymuriatic acid / By C.L. and A.B. Berthollet ; translated from the French, with notes and engravings ... by Andrew Ure.

  • Berthollet, Claude-Louis, 1748-1822.
Date:
1824
Catalogue details

Licence: Public Domain Mark

Credit: Elements of the art of dyeing. With a description of the art of bleaching by oxymuriatic acid / By C.L. and A.B. Berthollet ; translated from the French, with notes and engravings ... by Andrew Ure. Source: Wellcome Collection.

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    This operation gives the silk not merely a great whiteness, but, at the same time, creakiness or rustling in handling, (du crt ou du maniement), that is to say, a species of tremulous elasticity, which is perceived on pressing it between the fingers. | As the maniement gives a certain stiffness to silks, those must not be sulphured which are to be watered, (destinées a faire de la moire), be- cause they would give too much resistance to the impressions of the calender, under which the silks are passed to give them the undulations. In like manner, sulphuring cannot be applied to silks intended for felt, (bonneterie), because they would corrode the iron and steel of the tools with which they are to be worked, and occasion rust. | Sulphured silk takes on most colours badly ; and, therefore, previously to dyeing, it must be freed from sulphur, (desoufrée), by repeated soaking and shaking over in hot water. When silk is sulphured, if it be thought not to have sufficient azure for the wished-for shade, it must be azured a second time in clear water, without addition of soap, and then again sul- phured. | These properties of the sulphured silk are owing to the sulphurous acid which has com- bined with it, whose presence may be made per- ceptible by means of sulphuric acid, which im- mediately disengages sulphurous vapours from it.