Montana Chalks are environmentally friendly pigment sprays that are ideal for temporary outdoor markings or for indoor studio artwork. Great for events, advertisements, marketing campaigns or outdoor activities. Colors are deep-matte and high-covering and can be applied to sidewalks, walls, cardboard, or canvas. Markings can last from several days to weeks, depending on the climate and weather conditions. Non-hazardous to plants and can be used when landscaping or in the garden. Can be finished and sealed with spray varnish for permanent effects. White chalk 400 ml can.