The Vallejo Pigment Natural Siena is formulated with natural earth and synthetic pigments for excellent permanence and extraordinary light fastness. Its fine milling particles facilitate mixtures and ensure easy application on models and dioramas. With fantastic adherence, it can be easily applied using brush in its dry form on models. Whenever you want to portray a dry mud or accumulated dust, you can use thinner to fix this pigment in place. It is non-flammable and you can also use the pigments to create volumes like accumulated dirt and mud with pigment binder.