▁the ▁X uan he ▁P ain ting ▁Man ual , ▁which ▁is ▁a ▁catalog ue ▁of ▁paint ings ▁in ▁the ▁collection ▁of ▁Emperor ▁Hu iz ong ▁of ▁Song ▁( r . ▁ 1 1 0 0 – 1 1 2 6 ) ▁that ▁was ▁compiled ▁in ▁ 1 1 2 0 . ▁ ▁The ▁manual ▁records ▁the ▁Ad mon itions ▁Scroll ▁as ▁one ▁of ▁nine ▁paint ings ▁in ▁the ▁imperial ▁collection ▁by ▁Gu ▁Ka iz hi . ▁ ▁This ▁imperial ▁authentication ▁of ▁the ▁painting ▁meant ▁that ▁no - one ▁seriously ▁doubt ed ▁that ▁the ▁Ad mon itions ▁Scroll ▁was ▁a ▁work ▁by ▁Gu ▁Ka iz hi ▁until ▁modern ▁times . ▁ ▁The ▁first ▁suggestion ▁that ▁the ▁painting ▁was ▁not ▁an ▁original ▁Gu ▁Ka iz hi ▁painting , ▁but ▁a ▁Tang ▁D ynast y ▁( 6 1 8 – 9 0 7 ) ▁copy , ▁was ▁made ▁in ▁a ▁book ▁written ▁by ▁Hu ▁J ing ▁( <0xE8> <0x83> <0xA1> <0xE6> <0x95> <0xAC> , ▁ 1 7 6 9 – 1 8 4 5 ) ▁in ▁ 1 8 1 6 . ▁ ▁However , ▁it ▁was ▁not ▁until ▁the ▁ 2 0 th ▁century ▁that ▁art ▁histor ians ▁determined ▁on ▁sty list ic ▁grounds ▁that ▁the ▁painting ▁cannot ▁have ▁been ▁produced ▁during ▁the ▁Jin ▁D ynast y , ▁and ▁therefore ▁cannot ▁be ▁an ▁original ▁work ▁by ▁Gu ▁Ka iz hi . ▁ ▁However , ▁there ▁is ▁considerable ▁diver gence ▁of ▁opinion ▁between ▁exper ts ▁as ▁to ▁when ▁and ▁where ▁the ▁painting ▁was ▁made ,