plural of small copper

plural of white copper

plural of scarce copper

plural of cement copper

plural of bent copper

A synthetic chemical used as a colorant in paints and dyes. First used in 1929. In pure form it is an intense blue. It is chlorinated to produce very intense dark green, and brominated and chlorinated copper phthalocyanines are mixed to produce a yellower emerald green.

Having lower parts made of or covered by copper (especially of a ship or cookware). / (Britain, idiomatic) Thoroughly reliable; secure

Alternative spelling of copper sulfate

(chemistry) the common name for copper(II) sulfate, CuSO₄, which forms blue crystals and is used in agriculture, dyeing, electroplating and many other applications; reducing agents reduce it to the red cuprous sulfate

(geology) any rock containing commercially interesting amounts of copper