Food Coloring Markers can be used again and again just like regular markers! For best results, draw on foods which have a smooth dry surface. MARKER CLEAN UP: After use, wipe tip clean with a damp paper towel and store with other food items. MARKER INGREDIENTS: Purified Water, Propylene Glycol. Sugar, Gluten and Nut free. Does not write well on cake pops, candy melts and chocolates.