In terms of its composition, the dispersion of carbon particles is suppressed, and we added a thickness to an overall plain feeling. We also added the strength of the ink stick color. In terms of color, we added a slight blueness to the black base overall. It is a warm blue with a shade of gray blue that has a redness and opaqueness that acts as the thickness and strength of the color. As it gets older, the ink stick calms in color, and the separation of the core and bleeding and sharpness of the color comes out. As the ink stick dries, we believe its personality and features grow stronger. Manufactured in 1990