Electrochemical coloring of metals is a process in which the surface color of metal is changed by electrochemical techniques, i.e. cathodic or anodic polarization. The first method of electrochemical
Nobilis rings, picture from book A.Watt – Electro-deposition : a practical treatise on the electrolysis of gold, silver, copper, nickel, and other metals, and alloys, with descriptions of voltaic batteries, magneto and dynamo-electric machines, thermopiles, and of the materials and processes used in every department of the art and several chapters on electrometallurgy, London 1887.
Electrolytic patina on pewter
Various colors on titanium (anodic oxidation)
anodized stainless steel test plate (molybdate based solution, it can be used on pewter too)
Black oxide
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Black oxide or blackening is a conversion coating for ferrous materials, stainless steel, copper and copper based alloys, zinc, powdered metals, and silver solder. It is used to add mild corrosion res
Electrochemical coloring of metals
…Heat coloring of metals Black oxide Bluing (steel…
Screw with blackening