Electro-Plating Pewter

Take 1 ounce nitric acid, and drop pieces of copper in it until effervescence ceases; then add 1/2 ounce water, and the solution is ready for use. Place a few drops of the solution on the desired surface, and touch it with a piece of steel, and there will be a beautiful film of copper deposited. The application may be repeated if necessary, though once is generally sufficient. The article must now be washed and immediately be placed in the plating bath, when deposition will take place with perfect ease.

How To Clarify Beer

Take isinglass, finely shredded, 1 lb., sour beer, cider, or vinegar 3 or 4 pints; macerate together till the isinglass swells, and add more of the sour liquid until a gallon has been used. Strain and further dilute. A pound of good isinglass should make 12 gallons finings, and 1-1/2 pints finings is enough to clear a barrel of beer.

How To Deodorize Bisulphide Of Carbon

Distill with quicklime, the two substances having been in contact for 24 hours. The distillate is received in a flask partially filled with clean copper turnings. The lime remaining in the retort is strongly colored.

How To Powder Camphor

Take camphor 5 ozs., alcohol 5 fl. drachms, glycerine 1 fl. drachm. Mix the glycerine with the alcohol, and triturate it with the camphor until reduced to a fine powder.

Paraffine Candles

To dye beautiful red, purple, or violet tints, use aniline colors.

How To Disinfect Mouldy Casks

Wash first for about 5 minutes with an alkaline solution of soda, and then soak for 1 or 2 days with a liquor acidulated with hydrochloric acid.

Purifying Decomposed Chloroform

Shake up the chloroform with a few fragments of caustic soda.

Dyeing Leather Yellow

Picric acid dyes leather a good yellow, without any mordant; it must be used in very dilute solution, and not warmer than 700 Fahr. Aniline blue modifies this color to a fine green.

Hot Filtering

The apparatus consists of a tube of soft sheet-lead, which can be wound around the funnel containing the filter in the form of a spiral. One end of the tube passes through a cork in the neck of a flask, in which water, or other liquid of higher boiling-point, is boiled; the other end dips into a receiver, into which the condensed liquid flows.

Drying Gases

Anhydrous phosphoric acid is the best substance known for this purpose.

Adulteration Of Glycerine, With Sugar And Dextrine, To Detect

To 5 drops of glycerine add 100 to 120 drops of water, 0.4 to 0.6 grain of ammonium molybdate, 1 drop pure nitric acid, and boil for a minute and a half. If any sugar or dextrine is present, the mixture will assume a deep-blue color.

Purification Of Glycerine

To purify glycerine which has been for some time in use, add 10 lbs. iron-filings to every 100 lbs. of the impure liquid. Occasionally shake it and stir the iron. In the course of a few weeks, a black gelatinous mass will collect on the bottom of the vessel, and the supernatant liquid will become perfectly clear, and can be evaporated to remove any excess of water that may have been added to it.

A Simple Filter