A gold, black or silver-looking frame is not always showing the natural color of its base metal.
Manufacturers can use different surface treatments to create color and other surface properties.
Plating, vapor-deposited films, paint and protective coatings may all be used, and industry terminology is not perfectly standardized across manufacturers.
01 · BASE MATERIAL
There is a base metal underneath
Titanium, stainless steel or another frame metal can receive additional surface layers.
The visible color therefore does not necessarily identify the metal underneath.
Start by separating the base metal from the layers built on top of it. A titanium or stainless frame may receive intermediate layers, a color layer and a final protective layer in several steps. A gold or black surface therefore does not mean the entire frame is made from metal of that color, and the surface that touches skin can vary greatly between products.
02 · PLATING
Plating forms a metal layer on the surface
Electrochemical and related processes can deposit a thin layer of another metal on the substrate.
This can be used to adjust color, appearance and surface behavior.
Plating is a broad family of processes that forms a layer of another material on the surface. Electroplating is a common example in which electric current drives metal ions onto the workpiece, while electroless plating uses a different chemical mechanism. Eyewear may use multilayer stacks chosen for color, adhesion or subsequent finishing, so “plating” should not be reduced to one single recipe.
03 · COATING & DEPOSITION
“Coating” can describe several different processes
Frames may use different deposition and coating technologies.
PVD refers to a family of vacuum processes for forming thin films, while paint or separate protective layers may also be used. The labels coating or PVD do not mean every product has the same layer structure or performance.
PVD is a family of physical-vapor-deposition processes that forms thin films in vacuum by vaporizing or sputtering material onto the surface. It works differently from paint, electrophoretic coating or clear protective layers, yet retail language may describe all of them broadly as “coatings.” Plating and coating are therefore not perfectly exclusive boxes; the meaningful question is what materials and processes make up the actual surface stack.
04 · ADHESION
A stable surface layer depends on preparation and process control
Proper substrate preparation and processing conditions influence how well the layer remains attached.
Areas with repeated friction, such as inner temples or nose-contact regions, may show surface change earlier in use.
Service life depends on more than the process name. Base-surface preparation, cleaning and pretreatment, film composition and thickness, part geometry, sweat and repeated friction all affect how the surface ages. Temple interiors and nose areas may change before protected outer surfaces because they see more contact, so localized wear should be interpreted together with use history.
05 · WHOLE FRAME
Surface treatment is only one part of quality
A sophisticated coating cannot compensate for poor welds, hinges or alignment.
Conversely, a frame with a simpler finish can still be very good when its design and manufacturing are strong.
Surface treatment is only one part of frame quality. Uniform color and a stable coating cannot compensate for poor joints, hinges, screws or alignment, while a simple finish can perform very well on a precisely built frame. Process names such as PVD or plating are therefore technical clues, not automatic price or quality grades.
SOLUTION GUIDE
Solution guide
Check whether it is uniform.
Look for a finish that continues naturally.
Inspect for excessive local wear.
Check alignment and hinge condition as well.
GLANOS FITTING CHECK
Surface finish and pressure on the skin are separate issues
Incorrect nose-pad or temple fit can be uncomfortable regardless of the coating. The practical standard on this page is to separate material, geometry, surface work, assembly and worn fit instead of using price or a material label as a shortcut.
CAUTION
Do not predict durability from labels such as PVD or plating alone
Base material, pretreatment, layer composition and thickness, and real-world use all influence performance. Materials, processes and use conditions vary by product, so one manufacturing method should not be generalized to every frame.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
eyewear plating · eyewear coating · PVD · titanium eyewear · metal frames · frame finish