Bisulphide of Carbon. Bisulphide of Carbon. This is used in the arts, as a solvent for India rubber, gutta percha, etc. To procure it, Mulder recommends the following process as the most convenient. Provide an iron bottle (a quicksilver bottle answers very well), and make a second opening into it. To one opening adapt a copper tube bent twice at right angles; and to the other a straight tube dipping into the bottle. Having nearly filled the bottle with pieces of charcoal (recently heated to redness), and having screwed on the bent and straight tubes, place the bottle in a furnace, closing the mouth of the latter with a stone or clay cover in two pieces, hollowed in the centre so as to fit the upper part of the bottle, and defend it from the action of the fire. Connect the curved tube with a Woolfe's bottle half-filled with water, and placed in a freezing mixture; and when the iron bottle is sufficiently heated, introduce by the straight tube, fragments of sulphur, and immediately close the mouth of the tube with a plug. The bisulphuret, as it comes over, falls to the bottom of the water. Separate it from the water, and distil over dry chloride of calcium, or it may be purified by shaking up with mercury. See also Wagner's 'Chemical Technology.' Blacking, Liquid, for Shoes, etc. [Note. - By ivory-black, bone-black, which is usually sold under this name, is intended. True ivory-black has a more intense colour, but is too dear for general use.] 1. Ivory-black, 3 oz., treacle 2 oz., sweet oil 1/2 oz.; mix to form a paste; add gradually 1/2 oz. of oil of vitriol, and then half a pint of vinegar, and 1 3/4 pints of water, or sour beer. Some prefer mixing the oil of vitriol with sweet oil.

2. Ivory black 2 lbs., treacle 2 lbs., sweet oil 1/2 lb.; mix and add § lb. oil of vitriol, and beer or vinegar to make up a gallon.

3. Ivory-black 3 lbs., treacle 4 lbs., vinegar a pint, oil of vitriol 8 oz., water a gallon.

4. Ivory-black 2 lbs., neat's-foot oil 4 oz.; mix, and add 3 quarts of sour beer, or vinegar, and a spoonful of any kind of spirits; stir till smooth, and add 2 oz. of oil of vitriol, and sprinkle on it 1/2 drachm of powdered resin. Then boil together 3 pints of sour ale with a little logwood, and 1/4 oz. of Prussian blue, 3 oz. of honey, and 8 oz. of treacle. Mix, but do not bottle it for 2 or 3 days.

5. Ivory-black 8 oz., brown sugar or treacle 8 oz., sweet oil 1 oz., oil of vitriol 1/2 oz., vinegar 2 quarts. Mix the oil with the treacle, then add the oil of vitriol and vinegar, and lastly, the ivory-black.