It's good for saving paper, but not for practicing calligraphy. After a long time, you will lose the heavy feeling of calligraphy and feel no regrets when you put pen to paper. Your tolerant personality will gradually become loose. If you don't practice calligraphy well, you should learn it slowly. If you measure the weight of words on the screen, you will find that different words are put together for a long time and written subtly. If you do this to save paper, you will take a detour. Let's buy paper to practice! If you are doing environmental protection, you can buy "10,000 calligraphy towels" in this way, which can achieve the desired effect, but there is also a big drawback that you can't use past works to check for leaks and fill gaps, and achieve the effect of Excellence.
To sum up, if you are not short of money, you'd better publicize (recommend). It is more convenient to save money for writing cloth than to reuse it on rice paper.