Translucent Opalescent: mixes are about 50-50 cathedral color and white opal glass. The larger proportion of opaque white reduces light transmission and increases surface reflection.
White opal Irid
Iridescent Glass: The rainbow-like effect that changes according to the angle from which it is viewed or the angle of incidence of the source of light.
Iridescence is a deliberate effect achieved by the introduction of metallic substances into the batch or by spraying the surface with chemical solution and reheating it in a reducing atmosphere.