Russia iron
（重定向自Russian Iron）
Russia iron or Russian iron refers to a type of sheet iron produced in Russia during the 19th and early 20th century. This iron sheeting had a smooth, glossy black surface coating, sometimes greenish-tinged, which did not flake upon bending and made the sheets highly resistant to rusting. As well as its corrosion resistance, the finish would also withstand high heat; these two properties accounted for most of its uses. Kodak used it around 1906 for the manufacture of their Photographic Enlargers. These properties led to it being the standard for manufacturing gold pans at the turn of the 20th century.