Pittsburg, Pa. U. Peters.
An excellent mixture to use for cleaning and brightening brass castings is as follows: Two parts, by measure, of nitric acid, and three parts of sulphuric acid. To each quart of the acid mixture made up, add one pint of common salt and stir until dissolved. The solution may be held in any suitable receptacle, say, of glazed earthenware. It is only necessary to provide a vessel large enough for the immersion of the largest piece to be dipped. The pieces are simply dipped and removed at once, and then rinsed in clear water. This solution is intended only for cleaning and brightening the castings, and not for imparting any color. T. E. O'Donnell.
One ounce common soap, ½ ounce quicklime, ¼ ounce saltpeter. Mix into a ball and place in a crucible when lifted out of the furnace. This is sufficient for about 50 pounds of metal. W. R. Bowers.
Brass work that has become dirty or corroded in service may be cleaned in the following wash: 1/3 part nitric acid, 2/3 part sulphuric acid, and ½ pound common salt to each 10 gallons of solution. Dip the castings in the solution for half a minute and then rinse in boiling water and dry in pine sawdust. E. W. Bowen.
To produce light castings of brass and gun-metal with a clean face and fine skin, first dust the mold with pea meal and on top of same add a slight dust of plumbago; for heavy castings dust only with plumbago. W. It. Bowers.
To make a cleaning solution for brass work mix ½ ounce nitric acid, 1 dram saltpeter, 2 ounces rain water. Let the mixture stand a few hours and then the articles to be cleaned may be dipped in quickly and then rinsed off and dried.
R. M. K.