The stamping process uses the principle of hot pressing transfer to transfer the aluminum layer in the anodized aluminum to the substrate surface to form a special metal effect. Since the main material used for stamping is anodized aluminum foil, the stamping is also called anodized stamping. Electrochemical aluminum foil is usually composed of multi-layer materials, and the base material is usually PE, followed by separation coating, color coating, metal coating (aluminum plating) and glue coating.

The basic gilding process is to melt the hot melt silicone resin layer and adhesive agent on the anodized aluminum under pressure, that is, when the anodized aluminum is pressed by the hot stamping plate and the substrate. At this time, the viscosity of the melted silicone resin becomes smaller, while the viscosity of the special thermosensitive adhesive increases after being heated, so that the aluminum layer and the anodized base film are peeled off and transferred to the substrate at the same time. As the pressure is removed, the adhesive cools and solidifies rapidly, and the aluminum layer is firmly attached to the substrate, completing a hot stamping process. The face value and patterns on the bronzed Baccarat chips are stamped on the chip mold in this way.