has received a film of copper by the cyanide solution, to take it out, wash it in water, and attach to it a simple cell or weak battery, and put it into a solution of sulphate of copper.  If there is any part not sufficiently covered with copper by the cyanide solution, the sulphate will make these parts of a dark colour, which a touch of the finger will remove.  When such is the case, the article must be taken out, scoured, and put again into the cyanide solution till perfectly covered.  A little practice will render this very easy.  The sulphate solution for covering iron should be prepared by adding it by degrees a little caustic potash, so long as the precipitate formed is re-dissolved.  This neutralizes a great portion of the sulphuric acid, and thus the iron is not so readily acted upon.  When the iron is thus coppered, proceed to silver it in the manner recommended for silvering according to receipt No. 9; or if you want to put a very heavy coating of silver on it, make use of a strong battery.

21.  Soldering fluid

For mending articles of tin, iron, zinc, copper, and almost all other metals.  Take 2 fl. ounces of muriatic acid, add zinc till bubbles cease to rise, add 1/2 a teaspoonful of sal-ammoniac and 2 ounces of water.  Damp the part you wish to solder with this fluid, lay on a small piece of lead, and with a piece of hot iron or soldering iron solder the part.

22.  Solder for tin

Take of pewter 4 parts, tin 1 part, bismuth 1 part; melt them together.  Resin is used with this solder.

23.  Cold method of silvering iron with silver-plate

Polish the iron toy wish to silver, then damp it over with soldering fluid (receipt No. 21) When this is done give it a coat of No. 22 solder.  This is done by laying a piece of cold solder on the iron, and spreading it over with a heated soldering iron, when by this means you get the iron nicely plated with solder, then lay on your silver-plate evenly, and gently rub it over with the heated soldering iron, and it will become firmly united with the solder as the solder is with the iron, so that you have the iron beautifully plated with silver with very little cost or trouble.

24.  Hot method of silvering iron with silver-plate

First polish the iron you wish to silver, wet it well over with No. 21 soldering fluid; then having procured that kind of silver-plate which is tin on one side and silver on the other, place it evenly on, with the tined side next to the iron, then place it on the fire until the silver-plate melts down, then at once take it from the fire, and it will be firmly attached to the iron, and will be excellent plate; yet No. 23, the cold method, is to be preferred in most cases.

25.  Silvering looking-glasses with quicksilver