Studio High Viscosity Acrylic is a satin finish acrylic which is particularly well suited to work with materials and in relief because of its thick consistency. It retains the brush or painting knife marks. The colors can be used directly from the tubes or with Pebeo acrylic mediums depending on the desired effect; it adheres strongly and is indelible once dry. The formula of the Studio Acrylic pastes is free of heavy metals. Conforms to ASTM D-4236.