Citadel Contrast Paints by Games Workshop are a specially formulated, revolutionary acrylic paint. Contrast paints are designed to base, shade, and highlight your models all in a single application, drastically cutting down the time you spend painting your armies. Simply apply one layer over a light contrast undercoat and you will have a vivid base and realistic shading. All Citadel paints are non-toxic, water-based acrylic that are designed for use on plastic, metal, and resin miniatures. 18 ml of Iyanden Yellow.