There is a description in 'Utsuho monogatari' (The Tale of Utsuho) saying 'When Chunagon (vice-councilor of state) requested paper, someone handed a piece of yellowish paper and a piece of white paper by putting them on the lid of suzuribako.'
「宇津保物語」に、「中納言の君、紙もがなとの給へばきばみたる色紙一巻白き色紙一巻硯箱の蓋に入れて出されけり」とある。