Heat coloring of metals
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Heat coloring of metals is a relatively simple process that, in principle, produces interference colors on the surface of the metal. The colors depend on the temperature to which the metal is heated.
Scale of colors obtained by heat coloring of steel.This process is known as tempering when it is applied to the hardening of tools made of steel.
The various colors produced indicate the temperature the steel was heated to. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F)
Blackened steel test plate, oiled with linseed oil and then heated to 300 - 400 C
Titanium test plate, colored by heat
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
Heat coloring of metals
…Electrochemical coloring of metals Black oxide Bluing (steel…
Screw with blackening