These chalks are like no other chalk on the market. One chalk color will produce several effects, from a sparkle to a beautiful iridescent glimmer, depending on the color, type of paper and reflective lighting. After applying, leave to set for an hour to bring out the full color. Original Decorating Chalks can be used over glimmer chalks to bring out color intensity. For best results, use E-Z Chalk Pudgy Sponge Applicators.