Iridescent Ink
A semi-transparent ink with a nacreous glitter (fig. 1, a). It contains transparent pigments consisting of tiny mica scales covered with a thin film (fig. 1, b). The pigments cause interference of incident light and produces the colour changing effect, when changing the angle of view or entrance. The iridescent element is not seen at right angles.
a
b
Fig. 1. Iridescent ink. 100 Netherlands Antillean Guilders (2006):
a – applied as a composition. View under oblique light; b – zoomed area of the image