Due to high demand, we are now offering refills for our Primecolours Watercolours Pack of 18 set. Primecolours Watercolours Refills Pack of 6 includes six of the key set colours: white, deep black, lemon yellow, brilliant red, ultramarine and leaf green. Primecolours watercolours offers high quality vivid pigments in the portability and convenience of a pan palette. Water-soluble, these rich colours are transparent, matte and deliver clean colour mixing. Primecolours watercolours are designed for watercolour painting, colour mixing and painting explorations. Each block measures 30mm x 25mm and are 11mm thick making them long-lasting and ideal for the classroom. Suitable Surfaces: Primecolours Watercolours can be used on a variety of surfaces. For best results use on watercolour paper, watercolour canvas boards or mixed media paper. Otherwise a thick cartridge (and gt;110gsm), multipurpose or mineral paper are suitable too. It all depends on your budget. You can also use these paints to colour other absorbent surfaces such as cotton/calico (for non-permanent colour), canvas boards, Oz clay and Magiclay. Suitable Brushes: Use with watercolour brushes (natural or synthetic hair), Zart Dynamic brushes and waterfillable brushes. Tip: Palette colours can be lightly sprayed with water before use to improve workability. Keeps the creative flow going by replenishing favorite watercolor shades easily.Supports continuous artistic discovery without interruption.Encourages children to experiment boldly knowing supplies won't run out.