Brass jewelry is often oil-sealed (or lacquered) after being plated with imitation gold (such as PVD gold plating or electroplated gold) for several important reasons related to durability, aesthetics, and corrosion resistance. Here’s why this step is crucial:
Author: Robby
Brass jewelry is often oil-sealed (or lacquered) after being plated with imitation gold (such as PVD gold plating or electroplated gold) for several important reasons related to durability, aesthetics, and corrosion resistance. Here’s why this step is crucial:
Brass (a copper-zinc alloy) is prone to tarnishing when exposed to air, moisture, and skin oils, forming a dull, greenish patina (verdigris).
Imitation gold plating (even PVD or electroplated gold) is very thin (often just 0.1–3 microns) and can wear off, exposing the brass underneath.
Oil sealing (or clear lacquer) creates a protective barrier against oxygen and humidity, slowing down tarnishing.
Gold plating alone is soft and can wear off quickly with friction (e.g., from rings, bracelets, or necklaces rubbing against skin/clothing).
A sealing oil or lacquer adds a harder top layer, reducing scratches and extending the plating’s lifespan.
Over time, unsealed gold-plated brass can darken or discolor due to oxidation and chemical reactions (e.g., sweat, perfumes, chlorine).
Sealing helps preserve the bright gold-like appearance by preventing chemical interactions.
Some people are sensitive to copper or nickel (if present in the brass alloy).
Sealing prevents direct skin contact with the metal, reducing the risk of allergic reactions or green skin stains.
| Method | How It Works | Best For |
|---|---|---|
| Oil Sealing (Microcrystalline Wax or Silicone Oil) | Forms a thin, water-repellent layer | Budget-friendly, temporary protection |
| Acrylic or Epoxy Lacquer (Spray/Dip) | Hard, transparent coating | Long-lasting protection (1–2 years) |
| UV-Cured Coating | Dries instantly under UV light | High-end jewelry, durable finish |
| Parylene Coating (Vapor Deposition) | Ultra-thin, chemical-resistant film | Medical-grade or hypoallergenic jewelry |
✔ Avoid harsh chemicals (perfumes, chlorine, detergents).
✔ Clean gently with a soft cloth (no abrasives).
✔ Reapply oil/lacquer periodically if the coating wears off.
✔ Store in a dry, airtight container to minimize oxidation.
Oil-sealing or lacquering significantly extends the life of imitation gold-plated brass jewelry by:
✅ Blocking tarnish & corrosion
✅ Preventing plating wear-off
✅ Keeping the gold color vibrant
✅ Reducing skin irritation