What is chromaticism?

'Tis a rather compositional technique, interspersing the primary diatonic pitches and chords with other pitches of the chromatic scale.

Chromaticism is. more simply put, in contrast or addition to tonality or diatonicism (the major and minor scales).

It is a compositional technique interspersing the primary diatonic pithces and chords with other pitches of the chromatic scale