Langton Prestige is a superior quality watercolour paper manufactured using 100% cotton, the highest quality material for papermaking. Made traditionally on a cylinder mould machine, the paper features a natural whiteness with a soft touch and distinctive texture.- 12 sheets 300gsm (140lb) acid free watercolour paper. The surface of a Not (Cold Pressed) paper has a moderate texture. A Not sheet gets its name from 'not hot pressed'! It is made by taking a rough sheet and pressing it again without the felts. Not papers are generally considered the easiest to use.