clearsnap option pads feature removable color pads within each pad for expanded versatility. ideal for creating various color spectrum and direct to paper techniques. also easy to clean and re ink. colorbox pigment pads are water based and formulated to stamp on absorbent papers. slow drying inks are rich thick fade resistant non bleeding acid free and archival. the ink surface is raised for optimum results on any size stamp. stackable. non toxic. astm d4236 approved.