Pentel poster Color Prussian Blue, Pentel Poster Color U Prussian Blue No . 24 comes in 30ml glass container bottle. Easy to use reliable, This poster color is convenient to use, no fuss paints with strong, vivid colors and excellent coverage density. Refills available in individual pots. Tighten the bottle cap after each use. Mix with water adequately making drawing smoother. Color: Prussian Blue. 1 Piece of 30ml mini Bottle kit.