Step 4: Polishing
Polishing is to create a shiny and smooth surface by rubbing it or using a chemical action, leaving a surface with a significant specular reflection. polishing can also reduce diffuse reflection to minimal values. If polishing first coloring second, your product will be concavo-convex, which belongs to soft enamel. If coloring first polishing second, your product will be smooth, which belongs to hard enamel.