(sp

gr. 0.825). Agitate. Make next a mixture of Venice turpentine 2 parts, castor oil 2 parts, white wax 2 parts, sulphuric ether 6 parts. Heat together the first three substances, add the ether, and mix all with the solution of xyloidin. - M. Lauras.

Photographic Collodion

See Photography.

Various Colours

The principal dry colours will be found under Pigments. Other colours are noticed below.

Green

1. An infusion of saffron added to the above blues.

2. Sulphate of Copper 4 oz., bichromate of potash 1/2 dr., water q. s.

3. By adding to the above deep or light blues a small quantity of chromate or bichromate of potash till the desired tint is produced, various shades of green may be obtained.

4. Sulphate of copper, with chloride of sodium or of iron.

5. Emerald Green. Nitrate of copper 3 oz., hydrochloric acid 4 oz., nitric acid 4 oz., water 2 gallons.

6. Very Fine Emerald. Nickel 3 oz., hydrochloric acid 4 oz., nitrous acid 2 oz.: digest for 24 hours, add 2 gallons of water and filter.

Red

1. Dried rose petals 8 oz., boiling water a gallon; digest for 12 hours, strain; digest the roses with more water, and strain; mix the infusions, add a pint of diluted sulphuric acid, and filter.

2. Cochineal 1/2 oz., boiling water a gallon: digest, strain, add 1/2 oz. of sulphuric acid, and water to make up 2 gallons.

3. Crimson. Iodine, and iodide of potasssium, of each 2 drs.; triturate with a dr. of water, and add 3 gallons of water, and 4 oz. of hydrochloric acid.

4. For External Lamps. Camphine, strongly coloured with alkanet root.

Pink

1. Infuse 1/2 oz. of good madder in a quart of boiling distilled water; when cold, add 1 oz. of strong ammonia, and filter into 2 gallons of distilled water.

2. Dissolve chloride or nitrate of cobalt in water, and add sufficient carbonate of ammonia to redissolve the precipitate first thrown down; then water q. s.

Purple

To the last, add sufficient of the blue No. 3 to give the desired shade.

Lilac

Smalts 4 oz., nitric acid 4 oz.; let it stand 24 hours, add 2 gallons of water, 1 oz. of alum, and 4 oz. of water of ammonia. Or rather as the purple.

Yellow

1. Chromate or bichromate of potash, with water q. s.

2. Bichromate of potash 2 drs., pure water 4 oz.; dissolve, and add 4 oz. sulphuric acid, and 2 gallons of water.

3. Bichromate of potash, nitrate of potash, and water. Amber. 1. Deep chrome yellow 3 oz., pearlash 9 oz., water 2 gallons; boil gently for half an hour, take it off to cool, and add 6 oz. hydrochloric acid, and water to the desired colour.

2. Dragon's blood, digested with sulphuric acid, and diluted with water to the desired shade.

Oliv'e

Sulphate of iron 3 oz., sulphuric acid 3 oz., water 2 gallons; dissolve, and add the green No. 5. q. s. to brighten the colour.

Liquid Colours for Maps, etc

See Inks, Dyes, Chemique Blue, Lake Liquor, etc. Gamboge and some of the cake colours, mixed with water, are also used.