To create professional-grade silver coins, follow these 5 proven steps: melt 99.9% pure silver at 2000°F, extrude into strips, punch blanks, burnish with ceramic media, then strike designs using hardened dies. Our ISO-certified process adds dual electroplating and anti-tarnish sealing1 for lasting shine.
While basic minting follows these universal steps, our 12 years specializing in commemorative coins revealed three critical enhancements most suppliers miss. Let me explain how we optimize each stage for museum-quality results.
1. Precision Melting: Beyond Basic Pouring
Our furnace process includes:
- Argon gas shielding (prevents oxygen contamination)
- Real-time spectrometers (verify 99.95%+ purity)
- Continuous temperature logging
Last quarter, we reduced silver waste by 7% through improved melt control.
2. Blank Preparation: Where Most Fail
| Step | Standard Practice | INIMAKER® Enhancement |
|---|---|---|
| Extruding | Air cooling | Nitrogen-cooled rollers |
| Blank Cutting | Single-press punching | Laser-guided blanking machines |
| Surface Prep | Basic ball burnishing | Diamond-particle polishing |
The Paris Olympic coins required 0.005mm tolerance - achieved through these upgrades.
3. Strike Force Optimization
We adjust pressing parameters based on design complexity:
- Relief height
- Surface texture
- Edge lettering
For UAE royal coins, we developed a 3-stage striking process:
- 80 tons - Base impression
- 120 tons - Detail refinement
- 40 tons - Stress relief
Why Do Silver Coins Turn Black? The Science of Oxidation
That dark coating isn't dirt - it's chemistry in action.
Silver coins blacken due to sulfur reactions creating silver sulfide2. Humidity above 60% accelerates this process 3x faster. Proper sealing and anti-tarnish strips can delay oxidation for 10+ years.
The Oxidation Timeline (Based on Our Lab Tests)
| Condition | Days to Visible Tarnish |
|---|---|
| Urban Air (PM2.5) | 28 days |
| Coastal Area | 14 days |
| Museum Storage | 3650+ days |
We solved this for the British Museum's Tudor coins using our patent-pending ColorLock coating:
- Micro-crystalline wax base layer
- Nano-silver antimicrobial middle layer
- UV-resistant polymer top coat
3 Unexpected Sulfur Sources
- Paper envelopes (lignin breakdown)
- Wool display cases
- Certain adhesives
Your Custom Coin Production Partner
For educators and collectors needing demonstration-grade pieces, INIMAKER® offers:
- Student Kits: Pre-oxidized coins showing different tarnish stages
- DIY Plating Sets: Safe electroplating tools with video tutorials
- Archive-Grade Holders: Modular cases with humidity sensors
Our recent projects include:
- 5,000 pcs NATO training coins with intentional oxidation zones
- Paris 2024 Olympic holographic coins with built-in anti-tarnish strips
- Blockchain-tracked silver rounds for UAE royal archives
Conclusion: Preserve History Through Precision
Quality silver coin creation combines metallurgy expertise and proactive preservation. Choose partners who control the entire process.
Need Demonstration Coins or Custom Collectibles?
At INIMAKER®, we manufacture:
- 18K/24K gold-plated silver coins
- Dual-plated teaching specimens
- Museum reproduction pieces
✅ 15-day turnaround
✅ Free 3D digital proofs
✅ MIL-SPEC compliant packaging
Contact Joshua White for your silver preservation solution.
