Finetec Watercolor Metal Tin Set, 6-Colors, Pearlescent Flip-Flop SetThese pearlescent colors are handcrafted in Germany and dissolve with water and a brush, just like traditional watercolors. Lightfast and pigment rich, the paint can adhere to a variety of surfaces including paper, wood, cardboard, clay and stone. They work well with brushes and dip pens; simply brush the color onto a nib to use it as calligraphy ink.