How to Clean Coins: Tips for Restoring Old or Dirty Coins

Numismatics, the study of coins and currency, is a fascinating hobby for many collectors around the world. Whether you are collecting for the beauty of a coin or its historical significance, there is nothing more satisfying than holding a shiny piece of metal in your hand. Unfortunately, coins can become dirty and tarnished over time, losing their luster and appeal. The main challenge with cleaning coins is doing so without damaging them or reducing their value. In this blog post, we will explore safe and effective ways to clean old and dirty coins without causing damage. We will also discuss what not to do when attempting to clean coins and share tips on how to preserve your coin collection.

Why clean coins?

Why Clean Coins?

If you’re an avid coin collector, you know the importance of keeping your coins in pristine condition. Over time, coins can become dirty and lose their luster. This is particularly true for older coins or those that have been handled frequently. Cleaning your coins not only restores their appearance but also helps preserve their value.

Dirty coins can be a turn-off for many collectors, and their value can be affected by their appearance. A restored coin can sell for a much higher price than a dirty one. Additionally, restoring coins can be a fun and rewarding hobby for collectors. It gives them a chance to learn more about the history and significance of each coin they own.

Cleaning coins can also help restore their historical significance. Coins from different eras can tell us a lot about society, politics, and economics at the time they were made. By restoring these coins, we can better appreciate their historical value and the story they tell.

However, it’s important to note that not all coins should be cleaned. Some older coins may have a patina or toning that adds to their value and should not be removed. It’s always best to consult with a professional coin grader before attempting to clean any valuable coins.

In summary, cleaning coins is an essential step in restoring their appearance, value, and historical significance. It can be a rewarding hobby for collectors, but it’s important to proceed with caution and seek professional advice when necessary.

What not to do when cleaning coins

Abrasive Cleaners

Abrasive cleaners like toothpaste, baking soda, and metal polish are popular choices for cleaning dirty or tarnished coins. However, using these types of cleaners can actually do more harm than good.

Toothpaste, for example, contains abrasive particles that can scratch the surface of a coin, leaving it looking dull and worn. This is especially true for older coins with delicate surfaces or intricate designs. Similarly, baking soda can be too harsh for many coins, and overuse can lead to permanent damage.

Metal polish may seem like a logical choice for cleaning coins, but it often contains chemicals that can react with the metal and cause discoloration or corrosion. Plus, metal polish can be difficult to remove from small crevices and details on a coin, leaving behind residue that can attract dirt and dust over time.

Instead of relying on abrasive cleaners, numismatists recommend using safer, gentler methods for cleaning coins. These include soaking coins in distilled water or using a soft-bristled brush to gently remove dirt and grime. While these methods may not produce instant results, they are less likely to cause damage and can help preserve the value and condition of your coin collection.

In summary, while abrasive cleaners like toothpaste, baking soda, and metal polish may seem like quick-fix solutions for dirty coins, they can actually do more harm than good. By using gentler cleaning methods, you can ensure that your coins remain in top condition and retain their value over time.

Harsh Chemicals

When it comes to cleaning coins, using harsh chemicals such as bleach, ammonia, and vinegar may seem like an easy solution. However, it is important to note that these substances can actually cause more harm than good.

Bleach is a strong oxidizing agent that can react with the metal of a coin and cause discoloration or even corrosion. Ammonia is a highly alkaline substance that can also damage the surface of a coin by stripping away its natural patina. Vinegar, while not as corrosive as bleach or ammonia, is still acidic enough to cause damage over time.

It is important to avoid using these harsh chemicals when cleaning coins, especially if you are dealing with valuable or rare coins. Instead, opt for gentler cleaning methods that will preserve the integrity of the coin’s surface.

One safe and effective way to clean coins without using harsh chemicals is to soak them in distilled water. Simply fill a container with distilled water and let the coins sit for a few hours or overnight. Afterward, use a soft-bristled brush to gently remove any remaining dirt or debris.

Another alternative to harsh chemicals is to use a commercial coin cleaner that is specifically designed for use on collectible coins. These cleaners are formulated to be gentle and non-abrasive, making them a safe choice for preserving the value and condition of your coins.

In conclusion, while it may be tempting to use harsh chemicals to clean dirty or tarnished coins, doing so can actually do more harm than good. By avoiding bleach, ammonia, and vinegar and opting for gentler cleaning methods, you can ensure that your coin collection remains in top condition for years to come.

Cleaning Machines

Cleaning machines are often marketed as a quick and easy way to clean coins, but they can actually cause more harm than good. There are two main types of cleaning machines that collectors often use: tumblers and ultrasonic cleaners.

Tumblers: These machines use a rotating drum to agitate the coins and remove dirt and debris. While this method may be effective at removing surface dirt, it can also cause scratches and damage to the coins. Additionally, tumbling can remove the patina or toning on a coin, which can lower its value for collectors.

Ultrasonic Cleaners: These machines use high-frequency sound waves to loosen dirt and grime from coins. While this method may be gentler than tumbling, it still has its risks. The sound waves can cause microscopic vibrations that can damage the surface of the coin, especially if it has any cracks or weak spots.

In general, it’s best to avoid using cleaning machines on your coins. The risks of damage outweigh the potential benefits, especially when there are safer and more effective methods available. If you do choose to use a cleaning machine, be sure to follow the manufacturer’s instructions carefully and take extra precautions to protect your coins from any potential harm.

Instead of using a cleaning machine, consider using safe and gentle methods like soaking your coins in distilled water or using a soft-bristled brush to gently clean them by hand. With patience and care, you can restore your dirty coins without risking any damage or reducing their value.

Safe and effective ways to clean coins

Method 1: Soaking coins in distilled water

Soaking coins in distilled water is one of the safest and most effective methods to clean old or dirty coins. This method is particularly useful for removing dirt, grime, and other stubborn contaminants that have built up on the surface of the coin over time.

To begin, you’ll need a small container filled with distilled water. It’s important to use distilled water as tap water can contain minerals and other impurities that can damage the surface of the coin. Place the coins gently into the container, making sure they are completely submerged in the water. Allow the coins to soak for several hours, or even overnight, depending on how dirty they are.

Once the coins have soaked for an appropriate amount of time, gently remove them from the container and rinse them under running water. Use a soft-bristled brush to gently scrub any remaining dirt or grime from the surface of the coin. Be careful not to use too much pressure as this can scratch or damage the coin.

After brushing, rinse the coins thoroughly under running water and pat them dry with a soft cloth. Avoid rubbing the coins as this can leave microscopic scratches on the surface which can degrade their quality and value over time.

It’s worth noting that while soaking coins in distilled water is generally safe, it may not be suitable for all types of coins. Some coins may have a special coating or finish that can be damaged by prolonged exposure to water. If you’re uncertain whether your coins can be safely cleaned using this method, it’s best to consult with a professional.

Overall, soaking coins in distilled water is a gentle and effective way to remove dirt and grime from old or dirty coins, without damaging their surfaces. With a little patience and care, you can restore the shine and luster to your coin collection and preserve them for years to come.

Method 2: Using a soft-bristled brush

Method 2: Using a Soft-Bristled Brush

A soft-bristled brush is another effective method for cleaning coins. This approach is particularly useful for removing dirt and debris from small crevices or hard-to-reach areas on coins.

When using this method, it’s important to choose a brush with soft bristles, such as a baby toothbrush or a makeup brush. Avoid using a brush with stiff or abrasive bristles, as this can scratch or damage the surface of the coin.

To begin, gently rinse the coin under running water to remove any loose dirt or grime. Then, dampen the bristles of the brush with distilled water and use a gentle circular motion to clean the surface of the coin. Be patient and take your time, working slowly and carefully to avoid damaging the coin.

If you encounter stubborn dirt or stains, use a little bit of mild soap to help loosen the debris. However, be cautious when using soap and make sure to rinse the coin thoroughly afterward to remove any soap residue.

Remember, the goal is always to clean the coin without causing any damage. Don’t apply too much pressure or scrub too vigorously, as this can cause scratches or other damage to the coin’s surface. Gentle cleaning with a soft-bristled brush is often the best approach.

In some cases, professional cleaning may be necessary to restore a particularly damaged or dirty coin. However, before seeking out these services, it’s worth trying some gentle cleaning methods at home to see if you can improve the appearance of your coin collection on your own.

By taking the time to carefully clean your coins with a soft-bristled brush, you can help preserve their value and improve their overall appearance. So don’t be afraid to give it a try!

Final thoughts

Final Thoughts

Coin preservation, grading, and professional cleaning are important aspects of maintaining the value and integrity of a coin collection. Regardless of whether you collect coins for fun or investment purposes, it is essential to care for them properly.

Firstly, coin preservation is crucial for ensuring that your coins remain in good condition over time. Storing your coins in a safe and secure environment can help prevent damage from exposure to air, moisture, or other elements. Additionally, using protective materials such as coin holders or capsules can further protect your coins from scratches or other physical damage.

Secondly, coin grading is an essential step in determining the value of a coin. Professional grading companies use a standardized system to evaluate the quality of a coin based on its condition, rarity, and other factors. Knowing the grade of your coins can help you make informed decisions when buying or selling coins and ensure that you receive a fair price.

Finally, professional cleaning can be a viable option for restoring coins that are heavily soiled or corroded. However, it is essential to choose a reputable professional who uses safe and appropriate cleaning methods to avoid damaging your coins. Professional cleaning can also be expensive and may not be necessary for all coins.

In conclusion, proper coin preservation, grading, and cleaning can help you maintain the value and quality of your coin collection. Whether you are a seasoned collector or just starting, these tips can help you care for your coins properly and enjoy them for years to come.
Cleaning coins may seem like a simple task, but it requires patience and care to preserve their value and historical significance. As we’ve discussed in this post, there are safe and effective methods for restoring old or dirty coins, as well as harmful practices that can damage them beyond repair. Remember to avoid abrasive cleaners, harsh chemicals, and cleaning machines, and instead use distilled water and a soft-bristled brush to gently clean your coins. By taking the time to clean and preserve your coin collection, you can ensure that these precious artifacts will continue to inspire future generations with their beauty and historical importance.