A permanent marker or indelible marker is a type of marker pen that is used to create permanent or semi-permanent writing on an object. In general, the ink comprises a main carrier solvent, a glyceride, a pyrrolidone, a resin, and a colorant, making it water resistant. Most brands of permanent marker are available in a wide range of colors, from simple black to bright primary hues, and even fluorescent markers exist for use in marking clothing and other items. They are easy to use and do not require special equipment to apply. Permanent markers are usually made of polypropylene plastic with a rubber eraser attached to one end. This end is dipped into the ink supply and then pressed against any surface to be marked. The polypropylene tip rubs off some of the rubber and leaves a colored spot on the material. When removed from the surface, the polymer marker will still leave a mark because it contains chemicals that remain in the skin's surface to affect future pigment absorption. Semi-permanent markers are similar to permanent markers except that they wear away over time due to friction between the surface being marked and the tip of the marker. This makes semi-permanent markers ideal for use on paper, cardboard, etc. that you want to dye but not ruin with regular marker usage. Permanents and semipermanents can also be made using paint markers which are pens used to make temporary marks during painting.