Can I use black paper in the hard pen calligraphy competition?

It works. According to the rules of hard-pen calligraphy competition, it is known that hard-pen calligraphy is written with black pen or black gel pen, and the special paper for hard-pen calligraphy competition is thickened a4 special paper black paper, so hard-pen calligraphy competition can use black paper. Calligraphy is a relatively complete form of expression of calligraphy art and also a form of entertainment.