It’s Glow In The Dark Chalkology® Paste! Chalk this translucent paste over another color for daytime visibility. Light-exposed paste will show in darkness. Perfect for hard surfaces. It’s washable, forgiving when wet, and offers a hard, matte finish. Chalkology Paste Singles include .19 US fl. oz. Chalkology Paste is formulated for use with Chalk Transfer® designs and Chalk Couture™ surfaces. Can also be applied to other nonporous surfaces.