I recommend-Yidege-liquid ink is available in both large and small bottles, and it should be mixed with water when writing-go to the local shop that sells pen, ink, paper and inkstone-look for it, do you know any pens? Recommended-Shuangyang brand Shanlian Lake Pen (double is a traditional Chinese character, and this system does not support paying attention to trademarks when buying traditional Chinese characters)-Long dry front, long dry front, big long front, big long front-it works well, who knows who uses it.