Tempera blocks size 1 prussian blue pack of six blocks of a single colour block size 44 x 16mmwe never compromise on quality or price our tempera blocks are manufactured using only the finest pigments binders and fillers which means they are not liable to crack or crumble the colours are brilliant and opaque with a high degree of adhesion and lightfastness they are also readily soluble and give an almost instantaneous pick up with a wet brush