Always test on a small area first for suitability and chemical
Great for writing and covering large areas, these markers can be used on a wide variety of materials, including glass, paper, wood, clay, porcelain, stone, metal and mirrors. Not recommended and unsuitable for certain materials. It will cover most non-coated surfaces, and conforms to ASTM D4236. The paint used in the markers is lead free, acid free, weatherproof, and lightfast.