Liquid Chalk Markers 8 Neon Colors. PLEASE READ CAREFULLY- Color Quake chalk inks are designed to use on non porous surfaces. Please do not use on chalkboards. Always try a test area. So many applications to explore your art talents. Color Quake Chalk Ink Markers are great to use on glass, LED boards, mirrors, chalkboard stickers, plastic surfaces, glossy boards. To clean, just use a damp cloth to wipe clean. reversible 6mm tips offers additional creativity in your designs. Wedding announcements, graduations, birthdays, anniversaries, promotions on your storefront windows are just a few ideas for Color Quake Chalk Ink Markers. Lets your creativity go wild.