These are the three primary colors: red, blue, and yellow. By mixing these colors, you can enjoy a wide variety of hues. Since the same glue as sumi ink is used, the bleeding is very beautiful. By adding color to the color smoke ink, you can create a wide range of colors. There is no unnatural bleeding, and the ink color is beautiful. Color names: Red, Blue, Yellow Materials: Pigment, glue Size: Size of one stick: Approximately 1.4 cm wide x 1 cm high x 4.4 cm long I have tried writing with it once.