wood finishing To achieve this traditional look, fancy maple is used, finished with iron nitrate. Topics: Products_KitsTags: Iron Nitrate|Maple|Finishing|Colonial|Barn Gun|StockLast verified: 2026-08-17Also called: iron nitrate, iron-nitrate, aqua fortis, aquafortis, nitric acid stain, ferric nitrate, maple, curly maple, tiger maple, tiger stripe, figured maple, hard maple, sugar maple, fancy maple, extra fancy maple, plain hard maple, finishing, finish, stock finish, final finish, colonial american longrifle, colonial, colonial rifle, colonial american