《旧唐书·本纪·卷五》
二十日，皇上的诏令由于连续用白纸，大多被虫蛀，今后尚书省下达给各司、州、县的诏令，应全部用黄纸。
戊午，敕制比用白纸，多为虫蠹，今后尚书省下诸司、州、县，宜并用黄纸。
On the 20th, since most imperial edicts previously written on white paper were seriously damaged by insects, from now on edicts issued by the Ministry of the Imperial Secretariat to various departments, prefectures, and counties must all be written on yellow paper.