Metallic Cotman 8 Half Pan setMetallic Cotman 8 Half Pan set OVER 25% OF INTRODUCTION SPECIAL New metallic watercolours that add iridescence to your colour, can be used either mixed with watercolours or added as an iridescent layer over colour. They deliver a high level of iridescence and brightness compared to other metallic watercolours. For a beautiful lustre to be achieved Winsor & Newton use mica for iridescence that creates a more affordable, stable, permanent and lightfast