Iridescence - Wikipedia Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes Iridescence is caused by wave interference of light in microstructures or thin films
Iridescent - definition of iridescent by The Free Dictionary iridescent (ˌɪrɪˈdɛsənt) adj displaying a spectrum of colours that shimmer and change due to interference and scattering as the observer's position changes [C18: from irido- + -escent]
Cloud iridescence - Wikipedia Cloud iridescence Iridescent mid altitude clouds Iridescent polar stratospheric cloud at sunset over Aberdeen, Scotland Cloud iridescence, seen above the clouds covered with grey clouds, Pondicherry, India Cloud iridescence or irisation is a colorful optical phenomenon that occurs in a cloud and appears in the general proximity of the Sun or Moon