As an alternative to iridescent inks which cannot be used in offset, the pearlescent inks can be printed by offset and letterpress.
Those inks, printed preferably on a coated paper, will produce a pearlescent effect which cannot be reproduced by a scanner or a photocopy
For a print on standard offset paper, we recommend to deposit first a varnish which will avoid that the pearlescent ink will be absorded by the paper. The deposit of pearlescent ink must be important.
Pearlescent inks can be slighly coloured but in that case the colour will be very pastel.