Also known as "gun blue" is a chemical process that produces a a blue or blue black oxide finish on steel. The blues are often known as "niter" blues because of the use of nitric acid in the process. ...
A person who works with metals to make everyday things. The word "smith" is said to come from the word "smite" or "to strike" as with a hammer. Black refers to the color of iron and steel after it ...
4 词条