Metal Patina Solution Calculator
Calculate patina solution concentrations for copper, brass, bronze, and silver.
Covers liver of sulfur, vinegar, and ammonia methods.
Patina is a surface coating that forms on metals through chemical reaction, producing colors ranging from dark brown/black to blue-green verdigris. In jewelry making, patina is applied intentionally to add depth, highlight texture, and create an aged or antique appearance.
Common Patina Methods and Solutions
| Method | Metals | Color Result | Speed |
|---|---|---|---|
| Liver of Sulfur (LOS) | Silver, copper, brass, bronze | Black, grey, blue, gold | 10 sec – 5 min |
| Vinegar + Salt | Copper, brass | Blue-green verdigris | 1–24 hours |
| Ammonia fumes | Copper, brass | Blue-green, deep blue | 2–12 hours |
| Ferric Nitrate | Copper | Brown, dark brown | 30 sec – 5 min |
| Selenium Dioxide | Silver | Light grey to black | 1–5 min |
| JAX patina solutions | Silver, copper, brass | Various (product-specific) | 10 sec – 2 min |
Liver of Sulfur (LOS) Concentration
LOS is the most widely used patina for jewelry. It comes in solid lump, liquid, or gel form.
Standard working solution: 1–3 pea-sized lumps per 500 ml hot water. Or: 5–15 ml liquid LOS concentrate per 500 ml hot water.
Stronger solution = faster, darker result. Weaker solution = more control, gradual color buildup.
LOS Color Progression on Sterling Silver
As the silver is exposed to LOS, it passes through a sequence of colors:
- Gold / light bronze (5–15 seconds)
- Rose / copper (15–30 seconds)
- Blue / peacock (30–60 seconds)
- Dark grey (1–2 minutes)
- Black (2–5 minutes)
To capture a specific color, remove the piece and rinse immediately in cold water. The color sequence depends on solution strength, water temperature, and silver alloy.
Vinegar + Salt Verdigris Formula
For blue-green patina on copper or brass:
- 250 ml white vinegar (5% acetic acid)
- 15g table salt (sodium chloride)
- Method: Dissolve salt in vinegar. Either soak the piece directly or suspend it above the solution in a sealed container (fumes method).
Direct soak produces a uniform verdigris in 2–6 hours. Fume method (piece suspended above solution) produces a more natural, textured patina in 6–24 hours.
Ammonia Fume Method
- Place a small dish of household ammonia (2–3 tablespoons) inside a sealed container.
- Suspend the copper/brass piece above the ammonia (do not submerge).
- Seal the container and check every 2 hours.
- Produces deep blue to blue-green patina in 4–12 hours.
Add a pinch of salt to the ammonia for more aggressive and more green-toned results.
Worked Example — Liver of Sulfur for Sterling Silver Pendant
Target: antique dark grey patina. Solution: 2 pea-sized LOS lumps in 500 ml hot water (60–70°C). Dip the clean, degreased pendant for 2 minutes. Rinse in cold water. Buff high points with 0000 steel wool or polishing cloth to reveal bright silver highlights.
Surface Preparation
The metal MUST be clean and grease-free for patina to adhere evenly. Clean with:
- Dish soap and hot water
- Fine abrasive pad (Scotch-Brite)
- Rinse, do not touch the surface with fingers
Oils from skin will prevent patina from forming, creating blotchy results.
Sealing the Patina
After achieving the desired color, seal with:
- Renaissance wax (museum-grade microcrystalline wax): best for jewelry
- Clear lacquer spray: more durable but can yellow
- Beeswax: natural option, less durable
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