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Calling All Art-law-savvy People!

These colors are assorted by manufacturers, with reference to their light or dark shades, and from the above it is clear why the latter are somewhat higher in price. ANSWER TO THE ABOVE. P. S. – I once made this request of the Scientific American, but the answer was so vague that it was not of the least possible use to me. In some localities it is more economical to use the common sodic sulphate (Glauber’s-salt) in place of the soda itself. Place the resonant on a small filter, wash it with water, and dry it; its weight will give the amount of adulteration, and consequently the quantity of pure material. This is collected on the shore of the Malacca; the wood, bark, and leaves are boiled in water, and when evaporated there is added sago to give it a body; it is then dried in the sun ready for use.

Elm bark is very generally used in Norway for making leather, and it is said the fine Norway gloves are prepared from the elm bark, and that the softness and beauty of the leather are attributable to this bark. The white willow is used in Denmark for the manufacture of gloves. White box tests are performed with knowledge of their inner structure/ design/ execution of the tested surroundings. White willow, according to Davy, contains 16 per cent; birch bark, 1.6 per cent; beech bark, 2 per cent; weeping willow, 16 per cent; sumac, 16 per cent; and sassafras root, 58 per cent of tanning matter. Hemlock is principally employed in tanning in this countsy, and such leather is porous and absorbs moisture. It is also used in France for making the fine red leather and other fine kinds known as Russian leather. France uses the bark of a species of oak known as komes oak, a stunted shrub growing in the south of France.

Birch bark is used in Ireland for tanning bazils. The shrub which is called coppice oak has roots of a yellow brown hue, and is very rich in the tanning principle, and is used in France for tanning sole leather of first quality. Devidivi is also used in tanning operations, but has the bad reputation that leather tanned by it is porous and consequently absorbs moisture. It yields forty per cent of tanning matter. Cluster analysis yields eight environmental types that are discussed and tested for reliability in a holdout sample. Here gastric juices are mixed with the food in order to help break the molecules down into a form which can be absorbed in the intestinal tract. Salvaging and re-using parts not only can stop their getting into the soil, these procedures also help to reduce the amount of new manufacturing being carried out. 400 parts water, but also undecomposed calcic acetate, and even free sodic sulphate, because the mutual decomposition is never a complete one, as small quantities of the substances used remain together in solution in their original state.

One point must not be forgotten, which is, if we dissolve the pure sodic acetate, we have the same in solution. The sap or bark of this tree is boiled, the solution evaporated, and the astringent matter is taken by this process. It is a noteworthy fact that the Norway tanners use birch and willow in preference to oak bark. Russia also uses this bark in the manufacture of fancy leather, and the leather being impregnated with the oil of birch bark, which gives it a peculiar, agreeable smell. Catechu will produce four or five times the quantity of leather that oak bark will. A considerable quantity of this tannin is used, but the quality of the leather from catechu is not equal to oak bark tanned leather. This substance of catechu; or kassu, as the natives call it, has been introduced into Europe, but has not as tannin yielded satisfactory results.

I have a lot of coal-tar always on hand – more than the market here can use, and what I want to ask you is: 1st. Can I manufacture any of the anilin colors from it, profitably? An important point is, that the colors are brighter and of finer grain when they are formed rapidly in the kettles, and not slowly crystallized. 3d. About how much would a barrel of tar be worth when worked into any of the colors? The process is much quicker and the tanner is able to save time by the use of catechu; nevertheless the action of this substance on the leather is not satisfactory, as the leather is soft and spongy and absorbs moisture. It is said to harden the leather. 150 per tun, and is chiefly used by the glazed leather manufacturers. However, there are a few manufacturers around, such as Norma, Lapua and RWS, that still use the traditional process to make premium quality brass cases.