Authenticity Jitters: My Deep Dive into an Athenian Tetradrachm
June 16, 2025My Insights on Why You Should Never Tone a Gold Coin!
June 17, 2025I’ve always been fascinated by sunken treasure stories, and recently I got wrapped up in the tale of the SS Central America, lost off South Carolina in 1857. That ship held a king’s ransom in California gold, including San Francisco double eagles – but what really stopped me in my tracks was how the rust deposits formed perfect mirror images of the coins themselves. Let me walk you through what makes this so special.
The History and Impact of the Shipwreck
Digging into the backstory, I discovered the SS Central America carried hundreds of tons of iron that stewed in seawater for over a century. That iron created goethite rust that coated nearly every gold coin, acting like a time capsule until recovery crews brought them up. It’s incredible how disasters like this can create unexpected treasures that connect us directly with history.
Understanding Goethite Rust and Its Effects
What really grabbed me was how these rust deposits captured such perfect impressions. When conservators like Bob Evans carefully removed the crust, it often peeled off in big flakes that worked like nature’s own plaster casts. They mirrored every detail of the original coins – even the surface glow. This isn’t just decay; it’s like the coin left behind a fossil record of itself.
Restoration Techniques and Grading Insights
I spent hours studying Bob Evans’ rust removal methods. His gentle approach allowed many coins to grade Mint State after conservation. If you’ve got similar artifacts, take this to heart: always use specialists who know how to work carefully. Even when graders note corrosion in the details, proper conservation can leave you with something truly breathtaking.
The Spectacular Mirror Image Flake
Nothing prepared me for seeing that giant goethite flake from an 1857-S double eagle. It’s a perfect negative of the coin’s design, and here’s why it’s extraordinary:
- It preserves the original surface glow and minute details like a time machine
- Handle with kid gloves – embedding it in clear Lucite is your best bet against damage
- While pairing it with the actual coin would be a collector’s dream, finding these flakes is like hunting unicorns
Practical Preservation and Collecting Advice
From everything I’ve seen, treating these fragile pieces requires thoughtful care. Store them like you would fine wine – cool, dry, and stable. Forget harsh cleaners like Verdi-Care; encapsulation is your friend for long-term protection. If you ever score something this rare, document its story and get a pro appraisal – both your wallet and future collectors will thank you.
This whole journey showed me once again how coin collecting sits at the crossroads of science and art. For deeper dives, the CoinBooks archive is gold. Happy hunting!