▁supposed ▁copy ist ' s ▁error ▁is ▁the ▁apparently ▁confused ▁representation ▁of ▁the ▁pal an quin ▁frame ▁in ▁the ▁scene ▁of ▁Lady ▁Ban ; ▁but ▁recent ▁ult ra - v io let ▁exam ination ▁of ▁the ▁scroll ▁has ▁shown ▁that ▁there ▁has ▁been ▁considerable ▁rep ain ting ▁over ▁a ▁repair ▁to ▁dam aged ▁sil k ▁in ▁this ▁area . ▁ ▁An ▁advoc ate ▁of ▁a ▁pre - T ang ▁date ▁for ▁the ▁painting ▁is ▁W en ▁F ong , ▁emer it us ▁professor ▁of ▁Chinese ▁art ▁history ▁at ▁Pr inc eton ▁University , ▁who ▁has ▁argued ▁that ▁the ▁scroll ▁was ▁made ▁by ▁an ▁anonymous ▁painter ▁at ▁the ▁Nan j ing ▁court ▁of ▁one ▁of ▁the ▁Southern ▁dynast ies ▁( 4 2 0 – 5 8 9 ) ▁during ▁the ▁ 6 th ▁century , ▁and ▁that ▁although ▁the ▁painting ▁was ▁a ▁copy ▁of ▁a ▁Gu ▁Ka iz hi ▁painting , ▁it ▁was ▁heavily ▁influenced ▁by ▁the ▁painting ▁techniques ▁of ▁Z hang ▁S eng you ▁( active ▁c . ▁ 4 9 0 – 5 4 0 ) ▁and ▁Lu ▁Tan wei . ▁ ▁A ▁somewhat ▁different ▁hypothesis ▁has ▁been ▁advanced ▁by ▁Yang ▁X in , ▁a ▁professor ▁at ▁P ek ing ▁University , ▁who ▁arg ues ▁on ▁the ▁basis ▁of ▁art istic ▁style ▁and ▁call ig raph y ▁that ▁the ▁painting ▁must ▁have ▁been ▁produced ▁at ▁the ▁court ▁of ▁Emperor ▁X ia ow en ▁( r . ▁ 4 7 1 – 4 9 9 ) ▁of ▁the ▁Northern ▁Wei ▁dynast y ▁(