Before revision: Black for aluminum use boiling solution of 20 g ammonium molybdate and 5 g of sodium thiosulfate in a liter of water, immerse the objects, rinse, dry, wax or lacquer after the development of color.Krause, H.: Metallfärbung, Berlin 1922.
After revision: Black for aluminum Boil a solution of 20 g ammonium molybdate and 5 g of sodium thiosulfate in a liter of water, immerse the objects, rinse, dry, wax or lacquer after the development of color.Krause, H.: Metallfärbung, Berlin 1922.