MULTI-SURFACE: Use the chalk crayons to write on glass, windows and mirrors. They’ll work on cardboard, wood, whiteboards and no doubt these chalk sticks will write on chalkboards. The all-in-one writing device that can be used almost anywhere! WASHABLE: They will wash off easily on non-porous surfaces like glass and whiteboards but are a bit more permanent on porous surfaces.
Kingart Chalk Crayons, Multi-Surface & Washable, Set of 24 Unique Vibrant Colors
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The Best Conté and Artists' Crayons for Drawings and Mixed-Media Work –
The Best Colored Pencils
National Museum of American History
I Tested the 8 Best Crayon Brands, & The Winner Shocked Us!
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Compared: Water-Soluble Mediums