Pickle For Frosting And Whitening Silver Goods

Sulphuric acid, 1 dr.; water, 4 oz.; heat the pickle, and immerse the silver in until frosted as desired; then wash off clean, and dry with a soft linen cloth, or In fine clean saw-dust. For whitening only, a smaller proportion of acid may be used.

How To Make Red Watch Hands

1 oz. carmine, loz. muriate of silver, ½ oz. tinner's japan; mix together in an earthen vessel, and hold over a spirit-lamp until formed into a paste. Apply this to the watch hand, and then lay it on a copper plate, face side up, and heat the plate sufficiently to produce the color desired.

How To Case-Harden Iron

If you desire to harden to any considerable depth, put the article into a crucible with cyanide of potash, cover over and heat altogether, then plunge into water. This process will harden perfectly to the depth of two or three inches.

How To Tighten A Cannon Pinion On The Centre Arbor When Too Loose

Grasp the arbor lightly with a pair of cutting nippers, and, by a single turn of the nippers around the arbor, cut or raise a small thread thereon.

How To Refine Copper

This process differs from the one employed to refine silver in no respects save the place to be immersed; you use an iron instead of a copper plate to collect the metal.

If the impurities of gold refined were both silver and copper, you might, after saving the silver as above directed, sink your iron plate into the solution yet remaining, and take out the copper. The parts of alloyed gold may be separated by these processes, and leave each in a perfectly pure state.

How To Cleanse Gold Tarnished In Soldering

The old English mode was to expose all parts of the article to a uniform heat, allow it to cool and then boil until bright in urine and sal-ammoniac. It is now usually cleansed with diluted sulphuric acid. The pickle is made in about the proportion of one-eighth of an oz. acid to 1 oz. rain water.

How To Cleanse Silver Tarnished In Soldering

Some expose to a uniform heat, as in the case of gold, and then boil in strong alum water. Others immerse for a considerable length of time in a liquid made of ½ an oz. of cyanuret potassa to 1 pt. rain water, and then brush off with prepared chalk.

How To Frost Watch Movements

Sink that part of the article to be frosted for a short time in a compound of nitric acid, muriatic acid and table salt - one ounce of each. On removing from the acid, place it in a shallow vessel containing enough sour beer to merely cover it; then with a fine scratch brush scour thoroughly, letting it remain under the beer during the operation. Next wash off, first in pure water and then in alcohol. Gild or silver in accordance with any recipe in the chapter on plating.