One section of the Sosei Collection (the "iroshi" or "colored paper" version), a late Heian-period transcription of Sosei's personal house poetry anthology that was written on variously colored ornamental writing paper.
素性集（色紙）1帖－素性の家集（個人歌集）の平安時代末期の写本で、色変わりの装飾料紙に書かれている。