 The various colors, such as red, mauve, purple, violet and blue, in "Hydrangea macrophylla" are developed from one simple anthocyanin, delphinidin 3-glucoside forming complexes with metal ions.Commelinin, a blue pigment from the flowers of "Commelina communis", is a complex of 4 Mg2+ ions chelating six anthocyanin molecules.Cyanosalvianin, a blue pigment from the flowers of "Salvia uliginosa", is a complex formed of six molecules of the anthocyanin type, six molecules of the flavone type and two magnesium ions.