Sakura pen-touch black permanent paint marker with a medium tip is perfect to write on glass, wood, porcelain, plastic, paper or metal. The opaque paint flows from the chamber dire paper or metal. The opaque paint flows from the chamber directly to the top of the marker. marker features low odor, xylene free ink of archival quality that is chemically stable, waterproof and fade Sakura pen-touch black permanent paint marker with a medium tip is perfect to write on glass, wood, porcelain, plastic, paper or metal. The opaque paint flows from the chamber directly to the top of the marker. marker features low odor, xylene free ink of archival quality that is chemically stable, waterproof and fade resistant. paint is best seen on non-absorbent surfaces like coated paper. marker ink permanently adheres to most surfaces but not on glass or ceramics. marker is not recommended for use on fabrics intended to be washed. This marker needs to be given a quick shake before writing to mix the color and get the paint flowing.