Perth has long been famous for its dyeing and bleaching, the bleach-fields being mostly situated outside of the city, in convenient proximity to the Tay and Almond.
Hermite, which consisted in the production of bleach-liquors by the electrolysis (according to the 1st edition of the 1884 patent) of magnesium or calcium chloride between platinum anodes carried in wooden frames, and zinc cathodes.
Sunlight has a tendency to bleach furs and to encourage the development of moth eggs, therefore continued exposure is to be avoided.
It is also noted for its bleach and dye works, its engine works, foundries, paper factories, and production of silk goods, watches, jewelry, mathematical instruments, leather, chemicals, &c. Augsburg is also the centre of the acetylene gas industry of Germany.
The town has some trade in domestic produce, and in leather and linen manufactures, there being several flax spinning-mills and bleach-works in the immediate neighbourhood.
The former kind of bleach-liquor is mostly used in the industry of cotton, the latter in that of linen.
I took down this dwelling the same morning, drawing the nails, and removed it to the pond-side by small cartloads, spreading the boards on the grass there to bleach and warp back again in the sun.
This liquid is concentrated in vacuum pans to a specific gravity of 40° to 44° B., a small quantity of sodium bisulphite solution being added to bleach it, to prevent fermentation, and to inhibit browning.
A solution in hydrochloric acid, consisting of the chloride and hydrogen peroxide, is used for bleaching straw under the name of soda-bleach; with calcium or magnesium chlorides this solution gives a solid product which, when dissolved in water, is used for the same purpose (Castner, Journ.
But most of the chlorine is utilized for the production of bleaching-powder, of bleach-liquor, and of chlorate of potash.
The dark colours are very difficult to bleach, but the silk itself takes dye-colours much more freely and evenly than either tussur or eria silk.