(1) After having fine sandpapered the horns, dissolve 50 to 60 gr. nitrate of silver in 1 oz. distilled water. It will be colourless. Dip a small brush in, and paint the horns where they are to be black. When dry, put them where the sun can shine on them, and you will find that they will turn jet black. When done, polish off. (2) By boiling in infusions of various-coloured ingredients, and is done to imitate tor-toiseshell. Mix together pearlash, quicklime, and litharge, with a sufficient quantity of water, and a little pounded dragon's blood, and boil them together for 1/2 hour; apply this hot; for black - iron, iron filings, copperas, with vinegar applied on this.

(3) Black. 5.5 lb. burned lime are slaked in a little water, so that a powder-like hydrate of lime is obtained; this is mixed with 2*2 lb. minium, and this mixture is formed into a thick paste with such lye as soap-boilers use, having a specific weight of 1.036. The articles of horn are placed in this solution for 24 hours; they are then taken out, rinsed off with water, dried with a cloth, brushed over with rape-seed oil, and then again rubbed dry.

(4) Black. 0.14 oz. silver are dissolved in 2.1 oz. nitric acid (aqua fortis), and this solution is applied several times to the article to be stained, but it is absolutely necessary that the first coat should be entirely dry before another is applied. The articles are then burnished and made bright.

(5) Green. 0.52 oz. fine indigo-carmine are dissolved in 2.1 oz. rainwater. Then 0.175 oz. pure picric acid are dissolved in 2.1 oz. boiling hot rainwater, and both solutions are mixed together. A very beautiful, durable green colour will in this manner be obtained, and can be used for the various manipulations.

(6) Green. 0.35 oz. aniline green are dissolved in 4.2 oz. spirit of wine, and the horn to be stained is treated with this solution. All the different shades of green may be produced by adding blue or yellow stain.

(7) Green. 7 4.2 oz. copper cut up finely and gradually dissolved in 13 oz. nitric acid (aquafortis), and the articles to be stained are boiled in this solution until they have assumed a fine green colour.

(8) Purple. 17 5 oz. logwood are boiled in 4.4 lb. milk of lime, and the same method is observed as given in (9).

(9) Red. 17.5 oz. red Brazil-wood are boiled for 1 hour in 4.4 lb. milk of lime, and filtered through a cloth. The articles of horn, ivory, or bone to be stained are boiled for 1 hour in a solution of 1.05 oz. alum in 17.5 oz. water. They are then placed in the above stain, and allowed to remain there until the desired colour has been produced. Articles stained in this manner will acquire a beautiful purple colour by dipping them in alum-water.

(10) Bright red. 8.75 oz. logwood and 8.75 oz. red Brazil-wood are boiled in 4.4 lb. milk of lime. It is applied in the same manner as (9).

(11) Tortoise-shell. A rough dough is prepared from 17.5 oz. white litharge, 2.2 lb. finely-powdered unslaked lime, 3.3 lb. soap-boilers' lye having a specific weight of 1*036. The places of the horn which are to become dark are covered with this dough, and the horn is allowed to remain in contact with the dough for about 24 hours, until the latter has become entirely dry. The horn is then cleansed with a brush.

(12) Yellow. 17.5 oz. alum, free from iron, are dissolved in 4.4 lb. rainwater. The articles are allowed to lie in this for 1 or 2 hours. In the meanwhile 7 oz. yellow berries are boiled with 4.2 oz. carbonate of potash in 2.2 lb. water for 1 hour, and then strained. The articles stained with alum are placed in this decoction, and allowed to lie in it for 1 hour. They are then taken out and dried.