Old coins tend to become more valuable with age. If you're a collector, preserving your pieces is vital to maintaining their worth. Toward that end, avoid these common mistakes to protect your collection. 

3 Common Causes of Coin Damage

1. Cleaning

Unless collected and stored early on, old coins get dirty and grimy from years of use and handling. While your natural inclination may be to remove the buildup, doing so can harm the surface. Many metals, like copper, tarnish when exposed to moisture, and the chlorine added to most public water supplies causes corrosion. Additionally, many components in cleaning solutions are acidic, which eats away the surface and causes oxidation. 

If the coin was buried in soil or a harmful solution, then professional cleaning may be required to remove debris. Otherwise, leave it as is. The character provided by wear and tear is considered more valuable, allowing you to fetch more on the market if you decide to sell. 

2. Improper Handling

Like cleaning solutions, the natural oils and microscopic particles on your hands can tarnish and scratch collectible coins. Only handle them while wearing gloves. Organic cotton is preferred because the natural material is less likely to excrete toxins than synthetic options. Additionally, try to hold the pieces at the edges to limit surface contact. 

3. Inadequate Storage

Air and humidity are two of the biggest threats to old coins, which is why quality storage solutions are essential. Paper and cardboard folders and individual holders are common, but pulp-based materials release damaging acids over time and aren't moisture-resistant. Hard plastic, like those found in coin slabs, blocks out air and humidity. Purchase a PVC-free option to prevent chemical corrosion. 

Evaluate your old coins with the help of Hawaiian Islands Stamp & Coin in Honolulu. The business assists collectors across the islands and mainland by selling and buying unique coins, stamps, and paper money. They also provide appraisals. Learn more about their offerings on their website or by calling (808) 531-6251.