Cosmic Shimmer Opal Polish is a water-based and fast-drying medium, which contains a base color polish with the addition of mica in a complementary color, achieving beautiful opalescent effects for craft projects. When used on a dark card the mica color dominates to give a completely different look. The pots have their own incorporated delivery system making them easy to apply to a variety of surfaces, including card and MDF. Water-based and fast drying Unique in-built sponge applicator Contains a base color polish with the addition of mica in a complementary color to achieve beautiful opalescent effects The Pearl Collection of Cosmic Shimmer Opal Polish has been developed to give a subtle opalescent effect on white or light colored card showing a hint of their interference mica color; on dark or black card, the mica color dominates the opal shimmer. This gives an amazing contrast and two completely different color effects from just one pot.