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. This finish involves directly applying chemicals to the surface of architectural hardware products, followed by brushing to adjust the color tone and applying a clear coat, also known as dry sulfurization. Unlike GB plating (wet sulfurization), which involves immersion in a chemical bath, this method allows for less restriction in shape and size, enabling artisans to individually color and enhance each piece, resulting in a craft finish. 【Features】 ○ Available in three color tones: light, intermediate, and dark ○ The gloss is generally full gloss → 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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basic information
【Overview of the Manufacturing Process】 ○ Base Adjustment (Degreasing, etc.): Thoroughly remove oil and moisture. ○ Sulfurization Treatment: Apply sulfur paste to the design surface 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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Company information
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 are enhanced with piano finishes and color clear coatings that create a luxurious and vibrant atmosphere. We promise that various architectural hardware, both exterior and interior, will create the best visual appeal through the wisdom and skills of our skilled craftsmen.
