Vallejo True Metallic: Airbrush - Amber Green (77.175)20 base colors specifically formulated for airbrush application. These colors are chromatically matched to the Base colors. They offer a homogeneous finish and excellent color intensity. The are ready to use straight from the bottle, though they can be thinned with Airbrush Thinner for more subtle effects. Excessive thinning may lead to uneven finishes. View the Color Chart here How to use: Apply with an airbrush. Safety: Always follow the information