Anodizing
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Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts.
These carabiners have an anodized aluminium surface that has been dyed; they are made in many colors.
Colored anodized aluminium key blanks
Anodized stainless steel test plate (molybdate-based solution)
Colored iPod Mini cases are dyed following anodizing and before thermal sealing.
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
Anodizing
…Black oxide Electrochemical coloring of metals Phosphate conversion coating…
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)