A specialized non-toxic acrylic fluid wash (shade) produced by Games Workshop. 
A muted, earthy green hue. It acts as a transparent shadow layer that darkens recesses without overpowering base colors. Dries to a very effective matte finish. 
Specially formulated to flow easily over other paints and pool into the creases and deep details of a model, naturally highlighting textures. Ideal for adding depth to military camouflage, green armor, organic alien carapaces, foliage, or rotting flesh effects.