For an amber-coloured liquid for use in chemists' show bottles, dissolve 1 part of coarsely powdered dragon's blood in i parts of oil of vitriol, and dilute with cold distilled water. Blue liquid may be a diluted solution of (ft) 1 oz. of copper sulphate in 1/4 oz. of sulphuric acid, (b) soluble Prussian blue in oxalic acid, or (c) indigo in sulphuric acid. Crimson liquid is a diluted solution of 30 gr. each of iodide of potash and iodine in 1 dr. of water; or an infusion of 1 oz. of alkanet root in 20oz. of turpentine. For green, (a) dissolve 1 dr. of copper sulphate and 30 gr. of bichromate of potash in 2 oz. of liquid ammonia, and add 1 gal. of water; (b) dissolve 2 oz. of copper sulphate and i oz. of sodium chloride in 1 pt. of water; (c) dissolve distilled verdigris in acetic acid and dilute with Water; or (d) dissolve blue vitriol in water and add nitric acid until of the right tint. For magenta, dissolve acetate of rosaniline in water. Orange-coloured liquid is (a) a solution of bichromate of potash in water to which is then added a little sulphuric acid, or (b) a dilute solution of gamboge in liquor of potassa.

For pink, add to a sohition of cobalt nitrate or cobalt chloride sufficient sesquicarbonate of ammonia to dissolve 1 he precipitate first formed. For purple, (a) mix a solution of 2 dr. of sulphate of copper in 2 oz. of water with a solution of 1 dr. of French gelatine in 2 oz. of boiling water, and add 2pt. of liquor of potassa; shake a few times during ten hours, decant, and dilute with water; (b) dissolve loz. of copper sulphate in 1 qt. of water, and add 1 /12oz. of sesquicarbonate of ammonia; (c) add sufficient carbonate of ammonia to an infusion of logwood; (d) dissolve 3oz. of lead acetate and 1 dr. of cochineal in sufficient water; or (e) add sulphate of indigo, nearly neutralised with chalk, to an infusion of cochineal. For red, {a) dissolve 10 gr. of sulphocyanide of potassium to 1 gal. of water, and add 10 drops of a solution of per-chloride of iron; (b) dissolve carmine in ammonia and dilute with water; (c) dissolve cochineal in a weak solution of ammonia; (d) dissolve madder lake in sesquicarbonate of ammonia and dilute with water; or (e) dissolve cochineal in sal-ammoniac and dilute with water. For violet, mix together solutions of nitrate of cobalt and sesquicarbonate of ammonia, and add sufficient ammonio-sulphate of copper.

For yellow, (a) dissolve 11b. of sesquioxide of iron in 2 qt. of hydrochloric acid, and dilute with water; (b) add a little alum to a strong decoction of French berries; (c) dissolve either the chromate or bichromate of potassium in water; or (d) dissolve equal parts of nitre and potassium chromate in water. Multicoloured or variegated show bottles are formed by employing a number of liquids having different specific gravities and different colours. Pom-in the following solutions in the order mentioned, using a funnel and allowing the stream to fall upon a floating cork. (1) Chemically pure sulphuric acid tinted blue with indigo sulphate, (2) chemically pure and untinted chloroform, (3) glycerine tinted brown with caramel (burnt sugar), (+) castor oil tinted red with alkanet root, (5) 40 per cent, alcohol tinted green with aniline colour, (6) cod liver oil containing 1 per cent, of oil of turpentine, and (7) 94 per cent, alcohol tinted with aniline violet.

In filling show bottles, first put in sufficient distilled water and add the concentrated colouring solution, made as below, so as to give a tint which, with a light behind it, shows up better than a decided colour. The greater proportionately the diameter of the bottle, the less colour will be required. For a blue liquid, dissolve 1 oz. of blue vitriol in 5 pt. of water, and add sufficient ammonia water to dissolve the precipitate first formed. A green liquid may be made by adding bichromate of potassinm to the above blue one; if turbid, add ammonia water. For purple, dissolve 1 gr. of salicylic acid in 2 fluid drachms of alcohol and 2oz. of water; add 30 drops of tincture of chloride of iron dissolved in 2oz. of water. For red, dissolve A dr. of iodine by means of 1/2 dr. of iodide of potassinm in 1/2 pt. of water, and add loz. of muriatic acid. An orange tint is obtained by dissolving bichromate of potash in water. For yellow, dissolve 3 parts of bichromate of potash and 2 parts of carbonate of potassinm in water.

To prevent the bursting of the bottles by freezing, alcohol or glycerine should replace a part of the distilled water used for thinning the colouring solutions.