ArtGraf Watercolour Graphite allows for interesting and very expressive mark making offering an extensive scale of graphite greys that range from the deep blacks to more subtle, brighter and more transparent ones. Offering an extensive scale of graphite greys, Viarco ArtGraf Watercolour Graphite is a versatile painting medium - apply a wet brush directly onto the product, if you desire deep, intense blacks use a minimal amount of water and increase to more subtle brighter and more transparent greys the more water you add. 20g tin.