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GOLD, SILVER & METALLIC LUSTERS (LUSTER & METALLIC PAINT)
Introduction:
Gold, silver, and metallic lusters are decorative materials used to create precious metal–like reflective effects on the surfaces of ceramics, glass, metal, and construction materials. In the ceramic industry, they exist mainly in two forms: Luster (a liquid containing precious metal salts, fired at low temperatures to form a metallic layer) and Metallic Paint (industrial metal powders dispersed in a binder/solvent system). Metallic lusters give products an elegant, luxurious, and high-end appearance.
1. Classification and Composition
|
Luster Type |
Main Composition |
Primary Colors |
Thermal Application |
|
Ceramic Luster |
Precious metal salts (Gold, Platinum/Silver, Copper) dispersed in organic solvents and resin |
Gold (Au), Silver (Ag), Platinum (Pt) |
Low firing (usually below 800 °C) |
|
Metallic Paint |
Industrial metal powders (Copper, Aluminum, Mica) in acrylic/epoxy/silicone binders |
Gold (from copper/brass powders), Silver (from aluminum powders) |
No firing required (air-drying paint) or very low firing (decal) |
- Key Feature: High-end ceramic lusters typically use 18K–24K gold or platinum (Pt) to achieve permanent durability and lasting gloss after firing.
2. Technical Specifications
|
Parameter |
Ceramic Luster |
Metallic Paint |
|
Working Mechanism |
Solvent evaporation followed by reduction and crystallization of metal salts into a thin metallic film |
Additives and metal powders create a metallic reflective effect on the surface |
|
Adhesion |
Permanent (chemically integrated with the glassy glaze) |
Good adhesion (water-based or solvent-based systems), resistant to peeling |
|
Coating Thickness |
Ultra-thin (micron-level) |
Thicker (depending on paint layers) |
|
Safety |
Safe after firing (especially Pt and Au) |
Water-based systems are safer than solvent-based systems |
3. Key Applications in Industry and Ceramics
- Ceramic and Glass Decoration (Precious Metals):
– Gold Painting / Gilding: Luster is used for hand painting or decal printing (containing gold or platinum) on ceramics, sanitary ware, and glass, followed by low-temperature firing to firmly bond the metal layer, creating luxurious patterns and logos.
– Ceramic Jewelry: Produces sparkling details with high aesthetic and perceived value. - Architectural Decoration Industry (Metallic Paints):
– Interior & Exterior Decoration: Gold, silver, and copper metallic paints are applied to building materials such as gypsum, cement, reliefs, railings, and metal surfaces.
– Restoration Projects: Used in classical architecture, temples, monuments, and statues to create brilliant metallic effects with long-term weather resistance (thanks to acrylic-silicone or oil-based systems). - Gifts and Events:
– Gold metallic logos printed on ceramic mugs or tea sets for corporate gifts and commemorative items.
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