Treated with a chromate solution

plural of potassium chromate

(graph theory) The smallest number of colours needed to colour a given graph (i.e., to assign a colour to each vertex such that no two vertices connected by an edge have the same colour).

(optics) An optical aberration in which an image has coloured fringes, caused by differential refraction of light of different wavelengths.

(chemistry) A potassium salt of chromic acid, K₂CrO₄; the yellow crystals are soluble in water, and it is used as an analytical reagent.

(obsolete, inorganic chemistry) potassium chromate

(inorganic chemistry) The yellow calcium salt of chromic acid, CaCrO₄

(music) A scale including all twelve semitones in an octave.

plural of chromatic scale

plural of chromatic number