I am now producing ‘Irisé’ papers, a technique developed by the French wallpaper company Zuber who copyrighted it in 1843 for use with their block-printing process, naming it after the Iris. The design is printed on top of a hand-brushed colour ground blended with contrasting tones, using a manual brush carriage and graded pigment trough. The design itself can also be blended, printed dark-light-dark on top of the background which is blended light-dark-light – or vice versa. I screen print the blended design over the ground, a technique known as split-fountain printing. Here are Zuber’s copyright designs for creating a blended ground, including a rotating one for creating graded colour circles, see figure 12. My own brush carriage runs along the printing table’s registration rail, and I’ve made a similar graded pigment trough.