Any technique by which an unknown color is evaluated in terms of standard colors. The technique may be visual, photoelectric, or indirect by means of spectrophotometry. It is used in chemistry and physics. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
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Copper
A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.
Copper-63,Copper 63
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Ferricyanides
Inorganic salts of the hypothetical acid, H3Fe(CN)6.