Elements of Chemistry : Including the Applications of the Science in the Arts
Elements of Chemistry : Including the Applications of the Science in the Arts
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2 o o 914 NEUTRAL COLOURING MATTERS.
for several hours, and kept in a warm place till the supernatant liquor acquires a yellow colour. The protoxide of iron precipi- tated by the lime becomes peroxide, taking oxygen from the blue indigo, which in this altered state forms a compound with the lime, soluble in water. When the yellow solution of this compound is poured out or exposed to air, it rapidly becomes blue from the absorption of oxygen, the indigo loses its solubility and precipitates. In ...the usual process of dyeing, the indigo is fixed by dipping the yarn or cloth in the same solution of indigo, and then exposing it to air ; the indigo thus penetrates into the cloth in a soluble state, and is rendered insoluble afterwards by oxidation within its substance, so that it cannot afterwards be washed out. The sediment in the bottle yields more soluble indigo, when agitated again with pure water slightly heated, or with lime-water. The yellow solutions are mixed together and freely exposed to air, with the addition of a little hydrochloric acid to dissolve the salts of lime, and the blue indigo which precipitates is collected, washed upon a filter and dried.
What to read after Elements of Chemistry : Including the Applications of the Science in the Arts?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Graham to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
2 o o 914 NEUTRAL COLOURING MATTERS.
for several hours, and kept in a warm place till the supernatant liquor acquires a yellow colour. The protoxide of iron precipi- tated by the lime becomes peroxide, taking oxygen from the blue indigo, which in this altered state forms a compound with the lime, soluble in water. When the yellow solution of this compound is poured out or exposed to air, it rapidly becomes blue from the absorption of oxygen, the indigo loses its solubility and precipitates. In ...the usual process of dyeing, the indigo is fixed by dipping the yarn or cloth in the same solution of indigo, and then exposing it to air ; the indigo thus penetrates into the cloth in a soluble state, and is rendered insoluble afterwards by oxidation within its substance, so that it cannot afterwards be washed out. The sediment in the bottle yields more soluble indigo, when agitated again with pure water slightly heated, or with lime-water. The yellow solutions are mixed together and freely exposed to air, with the addition of a little hydrochloric acid to dissolve the salts of lime, and the blue indigo which precipitates is collected, washed upon a filter and dried.
What to read after Elements of Chemistry : Including the Applications of the Science in the Arts?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Graham to read onlineMoreLess
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