Good quality gouache colour is a combination of pigment and gum arabic. Gum arabic is the binder that holds the pigment, giving it that perfect creamy, flowing consistency (some cheaper brands may add chalk to the formulation which in turn affects the 'flow and the brilliance of colour'). As a result of the high level of pigmentation, Winsor & Newton Designers Gouache dries to a uniform matt finish. This reduces the reflection when photographing work, making it popular with designers and illustrators.Every colour within the range has an individual formulation to take advantage of each and every pigment characteristic and ensure tube stability.One of the natural attributes of gum arabic - the binder used in Designers Gouache - is that it is quick drying. This faster drying allows quick working techniques and preliminary sketching to be done. As with watercolour, work can be finished quickly making artwork while travelling or on the move much easier.Please note, due to trading agre.