Around the middle of the 10th century, kana arose as "sogana" (a cursive style of writing Chinese characters used for their phonetic value) developed into "onnade" (hiragana syllabary) and the "Tsugi-shikishi" is written in sogana.
10世紀半ばは、かなが日本の書道史草仮名から日本の書道史女手へ発展する頃で、『継色紙』では草仮名が使われている。