There are many varieties of ink pads. Red ones are generally divided into cinnabar, cinnabar, Guangzhou, etc. There are also dark brown antique ink pads and black, white, blue, green and other ink pads. Except for red ink pads, other ink pads are available. Colored ink pads are generally used less often except for special occasions. The calligraphy seal in your collection is black, which is a kind of special ink pad.