Product Description Sakuras Pigma ink, invented and patented in 1982, has become the standard for what is defined as reliable, permanent, archival quality ink. Pigma Brush is a flexible brush-tipped pen that responds to instant changes in pressure or direction. This special formulation of pigment based ink is more complex and stable than dye based inks. Illustrators, manga artists, cartoonists, calligraphers, and hobbyists can put pen to paper and leave a mark that will last a lifetime.