Permanent Ink: Markers with permanent ink, like the name implies, are permanent. In the ink there is a chemical called resin that makes the ink stick once it is used. Permanent markers are waterproof and generally write on most surfaces. Permanent marker ink is a type of pen used to write on various surfaces such as cardboard, paper, plastic, and more. The permanent ink is generally oil or alcohol-based. In addition, the ink is water-resistant.