A Dictionary of Arts (supplement): Bone Black.

A Dictionary of Arts (supplement): Bone Black.

(A Dictionary of Arts, Manufactures, and Mines; containing A Clear Exposition of Their Principles and Practice)
Recent improvements in
Arts, Manufactures, and Mines:
Being A supplement to his Dictionary
by Andrew Ure, M. D.,
F.R.S. N.G.S. M.A.S. LOND.; M. ACAD. N.S. PHILAD.; S. PH. SOC.N. GERM. HANOV.; MUHL. ETC., ETC.

Illustrated with one hundred and ninety engravings.

New York: D. Appleton & Company, 200 Broadway.  Philadelphia: George S. Appleton, 148 Chestnut St.
MDCCCXLVII
1847
BONE BLACK, or animal charcoal restored. A process for this purpose was made the subject of a patent by Messrs. Bancroft and Mac Innes of Liverpool, which consists in washing the granular charcoal, or digesting it when finely ground, with a weak solution of potash or soda, of specific gravity 1.06. The bone black which has been used in sugar refining may be thus restored, but it should be first cleared from all the soluble filth by means of water.



Mr. F. Parker's method, patented in June, 1839, for effecting a like purpose, is, by a fresh calcination, as follows: -

Fig. 8 represents a front section of the furnace and retort; and fig. 9 is a transverse vertical section of the same. a is a retort, surrounded by the flues of the furnace b; c is a hopper or chamber, to which a constant fresh supply of the black is furnished, as the preceding portion has been withdrawn, from the lower part of a. d is the cooling vessel, which is connected to the lower part of the retort a by a sand joint e. The cooler d is made of thin sheet iron, and is large; its bottom is closed with a slide plate, f. The black, after passing slowly through the retort a into the vessel d, gets so much cooled by the time it reaches f, that a portion of it may be safely withdrawn, so as to allow more to fall progressively down; g is the charcoal-meter, with a slide door.