We apply thermal spraying technology to our coatings. The purpose of this is to prevent corrosion of steel materials and to create an uneven surface, which is then coated to prevent the paint film from peeling off. This process has already become one of our basic technologies because of the unique texture it produces. However, this is only as a base coat. Therefore, we have continued to search for a way to go one step further, to achieve decorative treatment on the thermal sprayed substrate itself, and to use it as a "finished component" as well. This is because the pear-shaped surface unique to thermal spraying has an indescribable taste, and many of our clients prefer this finish. Ironically, however, it is also this nashiji that has prevented the development of such a finish. So we have been experimenting with every possible treatment agent to see if we could create a decorative finish. As a result, we developed a method to convert the thermal sprayed material into a black finish. This allows us to achieve a black leather-like color as a surface treatment for materials that used to be bright silver after thermal spraying.