Environmental damage happens when copper reacts with oxygen, moisture, and soil chemicals. This 1881 Indian Head Cent shows every stage of that breakdown, from green corrosion to missing metal. It is not a mint error, but it is a perfect example of how copper changes over time.
PMD stands for Post Mint Damage, the catch-all category for everything that happens to a coin after it leaves the mint. These coins aren’t errors and they aren’t valuable, but they can still be some of the most interesting pieces you’ll find in your change. This guide walks you through the most common forms of PMD, how to tell them from real mint errors, and why they’re still worth a second look.
Zinc rot and verdigris might look similar, but they tell two very different stories. Verdigris can often be stabilized or left alone. Zinc rot means the coin’s dying from the inside out. Learning the difference keeps you from wasting time trying to save what’s already gone.
Staying organized is what separates casual roll hunters from consistent ones. Label everything, keep notes, and end every session with a clean space so you can pick up tomorrow right where you left off.
A shiny coin isn’t always a good coin. Real value comes from originality, not polish. Once a surface is stripped or buffed, the damage can’t be undone, no matter how good it looks in photos.
Everyone hears “never clean your coins,” and it’s usually the right advice. But there are a few rare situations where it actually makes sense. Here’s when to consider it and how to do it without ruining the coin.
If you’ve ever stared at a crusty Wheatie or grimy nickel and thought about scrubbing it clean, you’re not alone. Every collector hits that moment. This post breaks down what really happens when you clean a coin, when it might be okay, and how to do it without turning your collection into a regret pile.
Shopping for coins online can feel like a minefield. This guide breaks down the most common red flags to watch for: sketchy titles, suspicious slabs, too-good-to-be-true pricing, and more. Learn how to spot trouble before you click “Buy.”