Dextrin Varnish

Dextrin 2 parts, water 6 parts, rectified spirit 1 part. - Baron de Sylvestre.

Diastase

Macerate ground malt in cold water; strain with pressure; heat the clear solution in a water-bath to 158° Fahrenheit to coagulate the albumen; filter again, and add rectified spirit as long as diastase falls. If required very pure, redissolve it in water, and again precipitate with spirit. Dry it at a low temperature. Well-malted barley contains about 1 per cent. of pure diastase; one part of which is capable of converting 2000 parts of starch into dextrin or sugar.

Dietetic Articles

For these see another division of the work.

Foot Powdrr

M. Paulcke prepares a mixture of salicylic acid, soap, talc, and starch in the form of powder, to be applied to the feet, which, whilst rendering them firm, is said to induce an agreeable softness, and to remove all unpleasant smell arising from perspiration.

Curriers' Dubbing

Made by boiling cuttings of sheepskins in common cod-oil.

Dryers for Painters

White copperas 1 lb., sugar of lead 1 lb., white lead 2 lbs.; ground with boiled oil.

Dupuytren's Pomade

See Hair Cosmetics, after Perfumery.

Dyes And Compounds Used In Dyeing

A few of the principal colouring matters and mordants may here be noticed; for further information, the reader is referred to Dr. Ure's 'Dictionary of the Arts,' Calvert's 'Dyeing and Calico Printing,' Crooke's ' Handbook of Dyeing and Calico Printing.'

Eau de Javelle

See Chloride of Potash.

How To Preserve Eggs

Jayne's Liquid (expired patent) is thus made: - Take a bushel of lime, 2 lbs. of salt, 1/2 lb. of cream of tartar, and water sufficient to form a solution strong enough to float an egg. In this liquid, it is stated eggs may be preserved for two years. Eggs may be preserved for several months if rubbed over with linseed oil or poppy oil.

Elaine

See Oleine.

Electric Tissue

Steep linen or cotton in a mixture of 1 part of strong sulphuric acid, and 3 of pure nitric acid, for an hour. Squeeze out the acid, wash with water until no sensible acidity remains, plunge it in a weak alkaline solution, then in water, and dry. By friction it yields a large quantity of resinous electricity.

Electro-brassing

Mr. Watt. Dissolve powdered acetate of copper, 5 oz., in 1/2 gallon of water; add 1 pint of liquid ammonia; dissolve sulphate of zinc, 10 oz., in 1 gallon of water, at 180° F., and when cool, add liquid ammonia 1 pint; dissolve potash, 4 1/2 lbs., in 1 gallon of water; lastly, cyanide of potassium, 8 oz., in 1 gallon of hot water. Now mix in the following order: add the copper solution to the zinc, and then the potash and cyanide, digest for an hour or so, add water to make up 8 gallons. Work with a brass anode and active battery power, adding occasionally a little more ammonia and cyanide.

Electro-bronzing

Brunel's Patent. Dissolve chloride of copper, 1 lb., in water 1/2 gallon, then carbonate of potash, 25 lbs., in water 6 gallons; and sulphate of zinc, 2 lbs., in hot water 1/2 gallon. Mix the solutions: add nitrate of ammonia, 12 1/2 lbs.; stir, and add water to 20 gallons. Work with an anode of brass and an active battery of two or more cells. Add occasionally some liquid ammonia and cyanide of potassium. These will prevent incrustations on the anode.