Furthermore, the amount of water and the quality of the water, such as whether the water is hard or soft, compatibility with the paper, temperature and humidity of the day when the sumi is used all affect the color of the sumi as well as how the sumi expands.
また水の量や硬水・軟水など水の硬度、紙との相性、書く日の気温や湿度によっても墨色や墨の広がりなどが変わってくる。