Democratic Sentinel, Volume 15, Number 18, Rensselaer, Jasper County, 15 May 1891 — Iron or Steel. [ARTICLE]

Iron or Steel.

To ascertain whether an article i» made of steel or iron, pour on the object to be tested a drop of nitric acid 1.2 specific gravity, and after it has acted for one minute rinse with water. If iron; the spot will be of a whit* h-gray colors if steel, it will appear as a black stain.