neoGRÜN doodle chalk is made from calcium carbonate, not gypsum. Calcium carbonate can be removed much more easily from surfaces like asphalt and concrete compared to gypsum. Chalk made from calcium carbonate is also brighter and more vibrant, as the pigments mix better with the natural material, resulting in higher color quality. Additionally, gypsum-based chalk is less resistant to sunlight, meaning artworks created with calcium carbonate chalk can last longer.
