It is a black coating composed of an alloy of nickel and phosphorus. The compound, developed by researchers at the U.S. v India in 1980, reflecting a 0.16 per 100 of visible light, that is about 25 times less than the black paint.
In 1990, Anritsu, Japan, produced a much darker version, and in 2002, the National Physical Laboratory of the United Kingdom developed a method for its manufacturing business.
In 1990, Anritsu, Japan, produced a much darker version, and in 2002, the National Physical Laboratory of the United Kingdom developed a method for its manufacturing business.
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