Colortime https: www.cchobby.nl akvarell-h-16-mm-d-44-mm-refill-72-piece-1-box

Transparent tempera watercolor colors in block form and with fine pigment content. . Try our beautiful block watercolor paint – especially popular with children and easily washable from your clothes. The paint blocks are made from cast tempera pigments, which are matte and non-permanent when dry. To get started on a painting project quickly, all you need is a stiff brush, some water, and some paper or cardboard to paint on. Tip: If the kids have trouble getting the paint to flow onto the smooth surface of the coloring block, they can rub it with a wet, stiff brush until the surface is no longer smooth.