The Treasures of Coal Tar
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If the fabric to be dyed is first im- pregnated ,with an alkaline solution of beta-naphthol and then immersed in a solution of diazotised para-nitraniline (no,<(^ yNH,), the dye, para- nitraniline red or para-red, is produced on the fibre. Dyeing with this pigment dye — ^as a dye produced on the fibre is called — ^is carried out on a very large scale, nearly two thousand tons of para-nitraniline being produced annually for the purpose. This process of dyeing can, similarly, be carried out with dyes containing an amino-group which can be diazotised on the fibre. Thus there is a very com- plex dye primuline, discovered by Professor A. G. Green in 1887, which will dye cotton directly of a yellow shade. This dye is somewhat fugitive, and is, consequently, of comparatively little value in itself. If, however, a piece of calico, dyed with primuline, is passed through a cold, dilute solution of nitrous acid, the primuline (which contains an amino-group), is diazotised; and if the fabric is then passed through a solution of an amine or phenol, a dye is produced or " developed " on the fibre.
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To quickly assess the difficulty of the text, read a short excerpt:
If the fabric to be dyed is first im- pregnated ,with an alkaline solution of beta-naphthol and then immersed in a solution of diazotised para-nitraniline (no,<(^ yNH,), the dye, para- nitraniline red or para-red, is produced on the fibre. Dyeing with this pigment dye — ^as a dye produced on the fibre is called — ^is carried out on a very large scale, nearly two thousand tons of para-nitraniline being produced annually for the purpose. This process of dyeing can, similarly, be carried out with dyes containing an amino-group which can be diazotised on the fibre. Thus there is a very com- plex dye primuline, discovered by Professor A. G. Green in 1887, which will dye cotton directly of a yellow shade. This dye is somewhat fugitive, and is, consequently, of comparatively little value in itself. If, however, a piece of calico, dyed with primuline, is passed through a cold, dilute solution of nitrous acid, the primuline (which contains an amino-group), is diazotised; and if the fabric is then passed through a solution of an amine or phenol, a dye is produced or " developed " on the fibre.
What to read after The Treasures of Coal Tar?
You can find similar books in the "Read Also" column, or choose other free books by Alexander Findlay to read online
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