I

Use Armenian bole mixed into a paste with oleic acid.

II

Rotten stone....... 1 part

Iron subcarbonate. . 3 parts Lard oil, a sufficient quantity.

III

Iron oxide......... 10 parts

Pumice stone....... 32 parts

Oleic acid, a sufficient quantity.

IV

Soap, cut fine....... 16 parts

Precipitated chalk .. 2 parts

Jewelers' rouge..... 1 part

Cream of tartar..... 1 part

Magnesium carbonate 1 part Water, a sufficient quantity. Dissolve the soap in the smallest quantity of water that will effect solution over a water bath. Add the other ingredients to the solution while still hot, stirring constantly.

To Remove Hard Grease, Paint, etc., from Machinery

To remove grease, paint, etc., from machinery add half a pound of caustic soda to 2 gallons of water and boil the parts to be cleaned in the fluid. It is possible to use it several times before its strength is exhausted.

Solutions for Cleaning Metals

I

Water.............. 20 parts

Alum.............. 2 parts

Tripoli............. 2 parts

Nitric acid.......... 1 part

II

Water.............. 40 parts

Oxalic acid......... 2 parts

Tripoli............. 7 parts