(inorganic chemistry) An insoluble dark, bright blue pigment, ferric ferrocyanide (equivalent to ferrous ferricyanide), used in painting and dyeing, and as an antidote for certain kinds of heavy metal poisoning.

Of a rich blue colour, tinted with green.

A deep blue colour, like that of the sky on a clear day.

Of a deep blue colour, like that of the sky on a clear day.

Of a bright, metallic blue colour (electric blue).

A greyish blue colour.

Of a greyish blue colour.

A pale blue color.

Of a pale blue color.

A purplish blue colour.