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Updated: June 10, 2025
"Come now, little Pax," she said, setting the boy in a chair in front of her, "you needn't try to deceive me. I'd know you among a thousand in any disguise. If you were to blacken your face with coal-tar an inch thick your impertinence would shine through. You know that the burglar is little Bones's father; you've a pretty good guess that I let him off.
If the acid is exactly neutralised by, that is combined with, the alkaline base to form fully neutralised salts, the litmus paper takes a purple tint. Coloured reagents such as litmus are termed indicators. A substance called phenolphthalein, a coal-tar product, is a very delicate indicator; it is more sensitive to acids than litmus is.
The result of experience brought into existence a new device. It has been called a flame projector, and has been described as a portable tank which is filled with a highly inflammable coal-tar product. The contents of the tank were pumped through a nozzle at the end of which was a lighting arrangement. The flame could be thrown approximately forty yards.
But they worked rather slow and talked very fast, and seemed in anything but a good humor. All their noses upwardly projected from their faces like so many jibbooms. Now and then pairs of them would drop their work, and run up to the mast-head to get some fresh air. Some thinking they would catch the plague, dipped oakum in coal-tar, and at intervals held it to their nostrils.
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.
Or had the pales of Paradise been just smeared with bad coal-tar? Not exactly: but across the path crept, festering in the sun, a black runnel of petroleum and water; and twenty yards to our left stood, under a fast-crumbling trunk, what was a year or two ago a little engine-house.
Numerous descriptions of methods of using coal-tar dyestuffs in hat-dyeing are available in different volumes of the Journal of the Society of Chemical Industry, and also tables for the detection of such dyestuffs on the fibre. Now I will mention a process for dyeing felt a deep dead black with a coal-tar black dye which alone would not give a deep pure black, but one with a bluish-purple shade.
Oh, George, she's a ripper perfectly lovely, without all those horrid clothes." George took his cigar from his mouth. "I shouldn't wonder," he said. Lady Elizabeth ignored the interruption. "And I believe she's Dick's," she went on. "Who is this Professor Caldegard?" "Scientific coal-tar big bug of the first magnitude," answered Bruffin.
We have treated many hundreds of cases of so-called chronic neuralgia, neuritis, rheumatism, neurasthenia, epilepsy and idiocy, due to the pernicious effects of quinine, iodine, arsenic, strychnine, coal-tar products and other virulent poisons taken under the guise of medicine. How do we know that this is so?
The dyeing industry has been radically changed during the last half century by the introduction of what are known as the artificial dyes, whilst the natural colouring matters which had previously been the sole basis of the industry, and which had been obtained by very simple chemical methods from some of the constituents of the animal kingdom, or which were found in a natural state in the vegetable kingdom, have very largely given place to those which have been obtained from coal-tar, a product of the mineralised vegetation of the carboniferous age.
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