VIII.—Antimonic chloride, 1 part; water, 6 parts; hydrochloric acid, 6 parts.
For Delicate Etchings On Steel.
II.—Silver acetate, 8 parts, by weight; alcohol, 250 parts; water, 250 parts; pure nitric acid, 260 parts; ether, 64 parts; oxalic acid, 4 parts.
III.—A copper chloride solution.
Etching Powder For Iron And Steel.
For lustrous figures on a dull ground, as on sword blades, the whole surface is polished, the portions which are to remain bright covered with stencils and the object exposed to the fumes of nitric acid. This is best done by pouring sulphuric acid, 20 parts, over common salt, 10 parts.
Relief Etching Of Copper, Steel, And Brass.
For Etching Copper, Brass, And Tombac.
Another compound consists of a boiling solution of potassium chlorate, 2 parts, in water, 20 parts, poured into a mixture of nitric acid, 10 parts, and water, 70 parts. For delicate etchings dilute still more with 100 to 200 parts of water.