《太平广记·卷八十一·异人一》
杰公又问他怎么没有带来紫盐与药用琥珀，使者说在来的途中，被北凉人掠夺去了，没有敢告诉你们。
因又向紫盐医珀，云自中路，遭北凉所夺，不敢言之。
Jie Gong also asked him why he did not bring the purple salt and amber, and the emissary said that it was looted by the Beiliang people on the way, and he did not dare to tell them.