The Brustro Watercolour paper is made of a valuable mixture of lignin free cotton and cellulose. The absence of acid guarantees the inalterability over time of the paper. Produced with 100% of E.C.F. pulp (Elemental Chlorine Free). It is sized internally and externally, guaranteeing optimal absorbance. The Heavy weight paper has a Professional Grade, Cold Pressed surface which is ideal for mastering watercolour techniques.