Lightfast and permanent, Colourfix paper is an acid free, 140 lb. (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. Thi s 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. The Cool Tones Pack contains one sheet each of white, natural/clear, black, elephant, rose grey, blue haze, storm blue, deep ultra, fresh gre y, and leaf green dark.