Ultrasonic cleaning has emerged as a highly effective technique for cleaning coins and ancient coins. This method involves the use of high-frequency sound waves to remove dirt, grime, and other contaminants from the surface of coins without damaging them. Ultrasonic cleaning is widely used by coin collectors, numismatists, and museums to restore the luster and shine of old and valuable coins.
Why Ultrasonic Cleaning is the Best Option for Cleaning Coins
Ultrasonic cleaning has several advantages over other cleaning methods when it comes to cleaning coins. Here are some of the key benefits of ultrasonic cleaning: Ultrasonic cleaning is a non-invasive method of cleaning coins that does not involve any physical contact with the surface of the coins. This means that there is no risk of scratching, scuffing, or damaging the surface of the coins during the cleaning process. Ultrasonic cleaning is highly effective at removing dirt, grime, and other contaminants from the surface of coins. The microscopic bubbles created by the ultrasonic vibrations penetrate even the smallest crevices and cracks in the surface of the coins, ensuring that they are thoroughly cleaned. Despite its effectiveness, ultrasonic cleaning is a gentle cleaning method that does not use harsh chemicals or abrasive materials. This makes it ideal for cleaning delicate and valuable coins that may be easily damaged by other cleaning methods. Ultrasonic cleaning is a time-saving method of cleaning coins, as it can clean multiple coins at once and in a short amount of time. This makes it ideal for cleaning large collections of coins.
Process for cleaning coins:
The customer's criteria for cleaning these coins is that they should be free from all contamination. The coins are contaminated with oxidation prior to cleaning. The components used for this cleaning process are the Kemet 12 Ultrasonic Cleaner and the Versa 120 Dryer. The cleaning agent used is 'S3', and de-ionized water is used for the rinse tank. The coins are made of copper plated steel and cupronickel.
The cleaning process involves the following steps: Preparing the cleaning solution: The cleaning solution is prepared by adding 10% of 'S3' to the Kemet 12 Ultrasonic Cleaner. The solution is heated to 45°C. Cleaning the coins: The coins are placed in the tank and run for a cycle of 5 minutes. After a quick inspection, it can be seen that the coin has brightened up, and the majority of the oxidation has been removed. The coin is then cleaned for a further 5 minutes. Rinsing the coins: The coins are then placed in the rinse tank for 3 minutes to ensure a thorough clean, removing any debris and left-on cleaning agent that could stain or etch the coin. Drying the coins: The coin is dried using a hot air dryer set at 65°C for 5 minutes. It is important to note that both coins were processed separately with the exact same process above to ensure consistency in the cleaning results. Results: After the cleaning process, both coins were 100% satisfactorily cleaned, meeting the customer's criteria for being free from all contamination.
| Ultrasonic Cleaner | Cleaning Agent | Temperature(s) | Concentration |
|---|---|---|---|
| Kemet 12 Ultrasonic Cleaner | S3 | 45°C | 10% |
| Kemet 12 | De-ionized water | 40°C | 100% |
| Versa 120 Dryer | N/A | 65°C | N/A |
Before cleaning Coins
After cleaning Coins
