New Policies
Much of Shen Kuo's written work was probably purged under the leadership of minister Cai Jing (1046–1126), who revived the New Policies of Wang Anshi, although he set out on a campaign of attrition to destroy or radically alter the written work of his predecessors and especially Conservative enemies. For example, only six of Shen's books remain, and four of these have been significantly altered since the time they were penned by the author.