The DecoColor® Extra Fine Paint Marker is perfect for adding details to drawings or for fine writing. It writes on glass, paper, wood, clay, porcelain, metal, and mirrors. The opaque paint is oil-based and acid-free. Note: Contains Xylene. Not recommended and unsuitable for certain types of plastics, leather, metals, finished wood, paper and fabric products. Always test on a small inconspicuous area first for suitability and chemical reaction.