When the copybook is written with clear water, it will immediately display black ink, which has the same effect as writing with ink on rice paper and can be reused.
Beginners are most suitable for writing with clear water brush, which is not only convenient and economical, but also hygienic and environmentally friendly. If a novice dips in ink with a brush, it will cost paper and ink when he makes a mistake, and it will cost paper and taste, making it all over the house, which is very unsanitary.