How To Restore The Lustre Of Jewelry

Take 1 oz. cyanide potassium and dissolve in 3 gills water. Attach the article to be cleansed to a wire hook, immerse and shake in the solution for a second or two, and remove and wash in clean water, then in warm water and soap. Rinse again, dip in spirits of wine, and dry in boxwood sawdust. If the solution is kept, put it in a tightly-corked bottle, and label Poison conspicuously. One caution is necessary: Do not bend over the solution so as to inhale the odor, nor dip the fingers in it; if one of the articles drops from the hook, better empty the solution into another vessel.

How To Protect Metal Surfaces From Moisture

Inclose them in tight compartments containing lumps of quicklime.

Platinum-Bronze

This is made of nickel 100 parts, tin 10, platinum 1. It is entirely unoxidizable, and especially adapted for cooking-utensils.

Coating Iron With Quicksilver

Clean the iron first with hydrochloric acid, then immerse it in a dilute solution of sulphate of copper mixed with a little hydrochloric acid, by means of which it becomes covered with a slightly-adherent layer of copper. It is then to be brought into a very diluted solution of mercurial sublimate mixed with a few drops of hydrochloric acid. The article will become covered with a layer of mercury, which can not be removed even by rubbing. This is good as a protection from rust.

Finishing Sadirons

See that your butt-wheels are well-balanced after they are covered. Let the wheel be covered with thick leather before covering with emery. Gel as good a surface on the article as you can from a wheel covered with No. 70 emery. Mix flour of emery with melted beeswax, and stir in till it is thick. When the mass is cool, rub it on a newly-covered wheel with No. 80 emery. Then set the wheel running, and hold on a flint to smooth it until the surface is sufficiently fine to suit.

Silver Ornaments, Imitation

Ordinary plaster models are covered with a thin coat of mica powder, which perfectly replaces the ordinary metallic substances. The mica plates are first cleaned and bleached by fire, boiled in hydrochloric acid, and washed and dried. The material is then finely powdered, sifted, and mingled with collodion, which serves as a vehicle for applying the compound with a paint-brush. The objects thus prepar-ed can be washed in water, and are not liable to be injured by sulphuretted acids or dust. The collodion adheres perfectly to glass, porcelain, wood, metal, or papier mache.

How To Regain Silver From Broken Black-Lead Crucibles

Pulverize the crucible and digest it in nitric acid for several hours. Decant off the clear liquid, and add to it muriatic acid until no further precipitate forms. Allow to settle, and again decant the clear liquid, wash the precipitate several times with clean water, dry, and fuse in a small crucible with a quantity of carbonate of soda.