Turn an ordinary window or mirror into colorful crystal canvas with Crayola Crystal Effect Window Markers. Watch as marker colors glaze over and crystallize before your eyes. Crystal effect is most intense with sun shining through the window. Marks are washable from windows, fabric and skin. Colors wipe off windows with a damp paper towel. Set includes eight bright, crystalized colors: brown, yellow, orange, red, violet, blue, green and crystal clear. Markers are certified AP nontoxic.