Browning, Or Bronzing Liquid

Sulphate of copper, 1 oz.; sweet spirit of nitre, 1 oz.; water, 1 pint. Mix. in a few days it will be fit for use.

Browning For Gun Barrels

Tinct of mur. of iron, 1 oz.; nitric ether, l oz.; sulphate of copper, 4 scruples; rain water, 1 pint. If the process is to be hurried, add 2 or 3 grains of oxymuri-ate of mercury. When the bund is finished, let it remain a short time in lime water, to neutralize any acid which may have penetrated; then run it well with an iron wire scratch brush.

Hardening Compound Used In Damascus Sword Blades

The blade is covered with a paste formed of equal parts of barilla, powdered egg-shells, borax, common salt, and crude soda; bented to a moderate red heat, and just as the red is turning to a black heat, quench it in spring water.