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Updated: June 12, 2025
Measures were defined later. Fortunately he prefaced his remarks by explaining his ignorance of the "technical matters involved in this aniline dye industry."
In a former chapter some slight reference has been made to those bye-products of coal-tar which have proved so valuable in the production of the aniline dyes. It is thought that the subject is of so interesting a nature as to deserve more notice than it was possible to bestow upon it in that place.
He printed his positive, dissolved his aniline dye, which was to be firelight effect, in the bathtub, and I should like to know what the landlord thought when next he viewed that tub! He made an orange bath for sunrise effects in one of the stationary tubs, and his light blue for night tints in the other.
The Different Kinds of Ink Met With Inks That Darken by Exposure to Sunlight and Air Introduction of Aniline Colors to Determine the Age of Writings An Almost Infallible Rule to Follow To Determine Approximate Age of Ink Possible The Ammonia System a Sure One A Question of Great Interest to Bankers and Bank Employes Thick Inks and Thin Inks So-called Safety Inks That Are Not Safe How to Restore Faded Inks An Infallible Rule Restoring Faded Writing Restored by the Silk and Cotton System That Anyone Can Arrange Danger of Exposing Restored Writing to the Sun.
The classical example of the mortal injury done to British manufacture by the British manufacturer's former contempt for the scientific man is that of the aniline dyes, which are so closely associated with the synthetic drugs as to form one subject of discussion.
As an instance of this Admiral Selwyn mentioned two prominent cases arising out of the pursuit of two widely differing branches of knowledge, in the one case by an outsider, in the other by a specialist. He referred to Sir H. Bessemer, one of his valued colleagues in the vice-presidency of the institute, and Mr. Perkins, the discoverer of aniline dyes.
The isolation of aniline from coal-tar is expensive, in consequence of the small quantities in which it is there found, but it was discovered by Mitscherlich that by acting upon benzene, one of the early distillates of coal-tar, for the production of nitro-benzole, a compound was produced from which aniline could be obtained in large quantities.
Accordingly hydrogen is taken up, and we get C H NH formed, which is aniline. Benzene from coal-tar is warmed with nitric acid in a flask. A strong action sets in, and on adding water, the nitrobenzene settles down as a heavy oil, and the acid water can be decanted off. To show you that aniline is formed, I will now produce a violet colour with it, which only aniline will give.
The aniline oils of commerce are very variable in character, the principal constituents being pure aniline, para- and meta-toluidine, xylidines, and cumidines. They are best known to the colour manufacturer in four qualities From the first of these, which is almost pure aniline, aniline black is derived, and a number of organic compounds which are further used for the production of dyes.
He also introduced railways and telegraph lines. Since the manufacture of aniline dyes abroad had diminished the demand for cochineal, Barrios decided to replace this export by cultivating coffee. To this end, he distributed seeds among the planters and furnished financial aid besides, with a promise to inspect the fields in due season and see what had been accomplished.
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