Lightfast and permanent, Colourfix paper is an acid-free, 140 pound (300gsm) smooth watercolor paper coated with Art Spectrum Colourfix Primer. The acrylic based primer allows the paper to hold multiple layers of pastels without the use of a fixative. This paper can withstand scrubbing, sanding, soaking, and erasure. It is suitable for other mediums besides pastel and charcoal, and the wide range of colors provide a variety of ambient backgrounds.The Warm Tones Pack contains one sheet each of sand, rich beige, Australian grey, soft umber, raw sienna, terracotta, burnt umber, olive green, aubergine, and burgundy.