Sakura Pen-Touch Paint Markers are quick drying, permanent markers with low odor and a xylene-free formulation. They work on paper, wood, glass, porcelain, plastic and metal. Available in Gold, Silver and White. The opaque white PenTouch markers write on dark surfaces and are most opaque on non-porous surfaces or coated paper stock. Great for marking on photographs or negatives. Not intended for use as correction fluid.