44b. William Blake, The First Book of Urizen copy D, plate 1. Relief etching, 14.9 x 10.3 cm., etched 1794, color printed and finished in watercolors 1794. British Museum. Detail showing that the texture of colors applied to the paper (the brush marks defining the edges of the knees) is smooth while the texture of printed colors is reticulated. Ink mixes with the colors printed on top of it, but opaque colors applied to the impression cover the ink more thoroughly than colors printed with and over the ink.