Shi zhu zhai shu hua pu [Ten Bamboo Studio collection of calligraphy and painting] (1633)

“This is the earliest Chinese book printed by the technique of polychrome xylography known as douban invented and perfected by Hu Zhengyan 胡正言 (1584-1674). The method involves the use of multiple printing blocks which successively apply different coloured inks to the paper to reproduce the effect of watercolour painting.” (source)