Watch as marker colors glaze over and crystallize before your eyes Crayola Window Markers allow kids to turn an ordinary window or mirror into colorful crystal canvas Unlike traditional coloring tools, these washable markers let artists draw and doodle on windows, mirrors or frames. They can also be used on items like ceramic tiles, rocks, glass and much more. Kids can feel free to use these Crayola markers for words, pictures and doodles while adults can use them for glass writing or as car window markers.