Chalk Mix Color Box All chalks are highly concentrated in color, are vibrant and have bright color payoff. Great visibility makes it perfect for use in large classrooms or lecture halls. Marks smoothly, creating clear and distinct lines on chalkboards and sidewalks. Our chalks erase easily leaving little to no residue on the chalkboard when removed. Chalk can be easily washed from most articles of clothing without leaving any unwanted permanent marks. Chalk generates little dust and fallout minimizing chances of smudging and messes when writing or drawing.