73.
IVORY BLACK.
5. Med dye —may be given by imbuing the ivory first with the tin mordant, th cplunging it in a bath of Brazil wood, cochineal, or a mixture of the two. Lac-dye
be used with still more advantage, to produce a scarlet tint. If the scarlet ivory b eplunged for a little in a solution of potash, it will become cherry red. ,
6. Violet dye —is given in the logwood bath to ivory previously mordanted for a shottime with solution of tin. When the bath becomes exhausted, it imparts a lilach h u ^Violet ivory is changed to purple-red by steeping it a little while in water containingfew drops of nitro-muriatic acid.
Witli regard to dyeing ivory, it may in general be observed, that the colors penel't*better before the surface is polished than afterwards. Should any dark spots appear, mmaybe cleared up by rubbing them with chalk; after which the ivory should be “7once more to produce perfect uniformity of shade. On taking it out of the boilin? n j-dye bath, it ought to be immediately plunged into cold water, to prevent the chancefissures being caused by the heat. a
If the borings and chips of the ivory-turner, called ivory dust, be boiled in watei;kind of fine size is obtained. .
The importation of elephants’ teeth for home consumption was, in 1834, 4,282 cW • ’in 1835, 3,698; and in 1836, 4,584 cvvts.; duty, 1 1. per cwt. ,
IVORY BLACK (Noir d’ivoire, Fr.; Kohle von Elfeubein, Germ.) is prepared * rivory dust, by calcination, in the very same way as is described under 'Bonk Black-The calcined matter, being ground and levigated on a porphyry slab, affords a betiful velvety black, much used in copperplate printing. Ivory black may h epared upon the small scale, by a well regulated ignition of the ivory dust in a covcrucible.
K.
the 5 ea '
JvALI. The Arabs gave this name to an annual plant which grows near c tedshore ; now known under the name of salsola soda , and from whose ashes they ex* g er .a substance, which they called alkali, for making soap. The term kali is used olirman chemists to denote caustic potash; and kalimn, its metallic basis ; inst ea “,° flS /ier,potassa and -potassium , of preposterous pedigree, being derived from the words l J0tthat is, ashes prepared in a pot. , jhe
KAOLIN (Terre a, porcelaine, Fr.; Porzellanerde , Germ.) is the name 5*®“ [gins-Chinese to the fine white clay with which they fabricate the biscuit of then P° rcSee Clay. Berthier’s analyses of two porcelain earths are as follows :—
Analyses.
From Saint Tries-
Silica ....
45-06
46-8
Alumina . . .
32-00
37-3
Lime ....
0-74
■-
Oxyde of iron
0-90
•—
Potass ....
_
2-5
Water
18-0
13-0 _
96-7
9£d>^___—
KARABE', a name of amber, of Arabic origin, in use upon the Continen ■ ; n cin e .''
KELP (Varec, Fr.; Wareck, Germ.) is the crude alkaline matter produce ^ r0 ck s *ating various species of fuci, or sea-weed. They are cut with sickles from ^ j fiathe summer season, dried and then burned, with much stirring of the pas J . j()0 re-analyzed many specimens of kelp, and found the quantity of soluble mat® soluble c °of the best to be from 53 to 62, while the insoluble was from 47 to 38.sisted of—
Sulphate of Soda -
. 8-0
19-0
5-5
Soda in carbonate and sulphuret -
. 8-5
37-5
Muriate of soda and potash
„
_
. 36-5
53-0
62-0