Abstract: A grinding paint has 30% to 45% of a copolymer of melamine, sulphonamide and formaldehyde, 30% to 45% of a resin, 20% to 30% of a solvent, 1% to 3% of a transparent paint, and 0.5% to 1.5% of an assistant agent. The resin is selected from a group consisting of epoxy resin, alkyd resin, amino-compound resin, and acrylic resin. The solvent is selected from a group consisting of alcohols, ketones, and aromatic compounds. The transparent paint is a metal-containing powder dissolved in the solvent to form a transparent liquid. The assistant agent is a silicon-containing liquid. The grinding paint is painted on a decoration bulb by spraying, dipping or showering to form a base coating layer on the decoration bulb. The base coating layer is baked at 150° C. to 250° C. for approximately ten to fifteen minutes.