?Clay used as a suspending agent for enamel slip is always at risk of resource depletion in the mines where it is produced, and the mine resources of our current clay, which is commonly used as a suspending agent for enamel slip, are nearing the end of their lifespan. For this reason, we have been searching for a new clay to replace our current clay for a long time, and have recently found a new clay that could be a candidate to replace our current clay. The new clay is produced by elutriating clay that is a by-product of the process of selecting silica sand from raw ore from domestic mines that mainly produce silica sand. Enamel slip that use this new clay has high pickup weight, and the bubbles that form inside the enamel due to the new clay are very small compared with our current clay (Figure). If the pickup weight of the enamel slip is high, the amount of clay contained in the enamel slip can be reduced, which is expected to improve the acid resistance and adhesion of the enamel. Furthermore, the small size of the bubbles not only improves the smoothness of the enamel surface, but also improves the whiteness of the titanium-based cover coat and the blackness of the ground coat. In this theme, we will present the characteristics of clays that have been considered for use as replacements for our current clay, explain the characteristics of new clay and the optimal conditions for use, and report on future prospects for the specifications of new clay aimed at improving the enamel properties of existing slip.