Few constraints on shape and size! Artificially enhanced processing finish with a brownish surface design.
The "sulfurized smoked finish" is a processing finish that artificially promotes the brownish surface design that appears on copper alloys as they age. It involves directly applying chemicals to the surface of architectural hardware products, brushing to adjust the color tone, and then applying a clear coat finish, also known as dry sulfurization. Unlike GB plating (wet sulfurization), it does not involve soaking in a chemical bath, allowing for fewer restrictions on shape and size, with each piece being hand-colored and finished by artisans. 【Features】 ○ Available in three color tones: light, intermediate, and dark ○ The finish is generally fully glossy → Semi-gloss or satin finishes (7/10 gloss) can be adjusted upon request ○ Applicable base materials: brass, red copper, copper, and other copper alloys ○ Base material surface: HL material, HL etched material, 3S material (mirror and bead materials cannot be colored) For more details, please contact us or download the catalog.
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**Overview of the Manufacturing Process** - Base Adjustment (Degreasing, etc.): Thoroughly remove oil and moisture. - Sulfurization Treatment: Apply sulfur paste to the surface design to promote oxidation. - Room Temperature Drying: Dry the paste. - Color Adjustment Treatment: Stabilize the color through brushing. - Air Blow Dust Removal: Remove the sulfur paste from the surface. - Clear Coating (Forced Drying): Perform clear coating. - Inspection and Packaging: Confirm color and other aspects thoroughly, and package securely. For more details, please contact us or download the catalog.
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Koei Protech Co., Ltd. is involved in a wide range of metal product painting and special surface treatments. For traditional Japanese structures such as temples and shrines, we apply sulfur blackening, verdigris, and red rust finishes to evoke the aesthetic of wabi-sabi. Additionally, modern interiors can be enhanced with piano finishes and color clear coatings that create a sense of luxury and vibrancy. We promise that various architectural hardware, both exterior and interior, will create the best scenery through the wisdom and skills of our skilled craftsmen.