Papurau Newydd Cymru

Chwiliwch 15 miliwn o erthyglau papurau newydd Cymru

Cuddio Rhestr Erthyglau

14 erthygl ar y dudalen hon

HOME PLATING. I

Newyddion
Dyfynnu
Rhannu

HOME PLATING. I There arc several methods of plating with- out a battery, some of which consist of mix- ing certain proportions of silver nitrate, common salt, and cream of tartar, making a powder which is applied with a damp cloth. These rub-on powders are not very satisfac- tory. The more useful materials are liquid pre- parations, most of which depend upon cyanide of potash for their good results, and for that reason are extremely dangerous to make and to handle. The following mix- ture is a much safer method, says "Popular Science Siftings," and if cape is used in the mixing it gives excellent results. For a silvering bath, dissolve Joz. of nitrate of silver in 4oz. of rain or distilled water, and when it is completely dissolved add a pince of hyposulphite of soda, which will form a brown tobacco-like precipitate. Later this will re-dissolve if enough hypo- sulphite soda has been added-a slight ex- [ cc>-w of the soda is necessary. This solution may be used by rubbing it on the article to be plated with a sponge, or the article may be suspended in it. In some cases a pair of tweezers made of a strip of zinc with which the article is gripped while plating is a great help. Steel, bri,s, and nickel may be successfully plated in this way. The solution for gold is made in the same way as the silver solution, except that chloride of gold is used instead of silver nitrate. In plating with gold, however, the colour is apt to be very disappointing, as it comas out a dark coppery hue. This may be overcome to a great extent by first giving the article a coat of silver plating and then apply the gold solution. If such precaution is taken the colour is generally a light gold and verv pleasing. The zinc tweezers may help considerably in making the plating take hold. Both the plating solutions when properly made and applied are excellent and generally give yood results. All articles must be thoroughly cleaned to remove any grease, and not handled so that no finger marks will appear until the plating is completed.

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