Verdigris
Verdigris refers to the blue-green discoloration that occurs on the surface of copper and other copper-containing metals, or to a metal accessory finish that reproduces that look.
Contents6 sections
Definition and Overview
Verdigris originally refers to the blue-green discoloration that appears on the surface of metals containing copper, such as copper and brass, when they are affected by moisture and components in the air. In apparel materials, a finish that expresses this aged color tone and texture as a design effect is also called verdigris.
Verdigris on press fasteners and eyelets is not the name of the type of metal fitting, fastening method, or part configuration. It is a term for the surface color or processed appearance, and may refer either to actual corrosion products adhering to the surface or to an effect created by painting or plating.
Materials and Part Configuration
A verdigris-like appearance may be used on metal accessories with a base material of copper, brass, or similar metals. On the other hand, because the base material and surface treatment method cannot be determined from appearance alone, specifications should separately confirm the material, the type of plating or coating, and the color name.
Press fasteners are generally used by combining multiple parts such as the front cap, socket, spring or ring, and post. Eyelets are metal parts that reinforce holes, and there are specifications that combine them with washers. The range of parts given a verdigris-like finish varies by product.
- Specifications that make use of the natural discoloration of copper or brass
- Specifications that express a blue-green color by painting or plating
- Specifications that apply the color tone only to part of the components
Size Expression and Attachment Method
Verdigris itself does not have a specific size standard. Press fasteners are selected by cap diameter and post length, while eyelets are selected by inner diameter, outer diameter, and post length. In addition to the dimensions of each part, it is also necessary to confirm whether the mating part uses the same standard.
For attachment, use the corresponding setting tools, hand press, foot press, or air press. Use setting tools that match the shape and size of the fitting, and before mass production, carry out test setting on the actual fabric, interfacing, and layered sections.
Main Applications and Fabric Thickness Considerations
Verdigris-like fittings are used for outerwear, bags, workwear-style garments, and decorative costumes where an aged look is desired. Assume the usage environment and washing method, and decide the fitting specifications, including whether they are for garments or bags.
If the fabric is too thin, the post area may not be stable, which can lead to cracking, pull-out, or tearing around the edge. If it is too thick, the post length may be insufficient, or the parts may not be sufficiently clinched. If necessary, use interfacing, pressing cloth, or washers to distribute the load.
Discoloration and Quality Control
In metals containing copper, the color tone may change due to moisture, sweat, detergent, storage conditions, and other factors. Even when natural verdigris is used as part of the design, check for color transfer, discoloration of contacting fabric, surface peeling, and appearance changes after washing according to product requirements.
For products that require consideration of nickel, confirm whether there is a nickel-free indication and the scope of application. Also, since metal press fasteners and eyelets may trigger a needle detector, clearly state in the production specifications whether needle detector compatibility is required, the inspection process, and foreign matter control.
Frequently Asked Questions
Are verdigris fittings always made of copper or brass?
Not necessarily. Verdigris is the name for discoloration that occurs in metals containing copper, but in apparel materials, blue-green color expression created by paint, plating, or other surface treatments is also called verdigris-like. Confirm the base material and finish in the individual specifications.
Can a press fastener with a verdigris finish be attached with a regular setting tool?
A setting tool matched to the type of press fastener, cap diameter, post shape, and part configuration is required, not one chosen by color or finish. An incompatible setting tool or excessive pressure can cause scratches on the surface finish, deformation, or poor engagement. Always carry out a test setting on the actual item.
Will verdigris-like fittings discolor when washed?
The way they change differs between metals that use natural discoloration and metals whose color is created through surface treatment. Because appearance may change due to sweat, detergent, friction, and moisture, it is important to conduct tests that assume washing or no washing and the intended usage environment, and to avoid leaving them wet.
