It is human nature to want things to look shiny and new. But in numismatics, trying to make an antique coin look new is the fastest way to destroy its value.
The Value of Original Surfaces
Collectors prize the original surface of a coin. Over decades silver develops a toning and copper acquires a chocolate-brown patina. This oxidation protects the coin and proves its age and originality.
What Happens When You Clean a Coin
Abrasive cleaners or acidic dips strip away the protective patina. Even wiping a coin with a cloth leaves microscopic parallel scratches called hairlines. Once cleaned the metal takes on an unnatural harsh shine that experienced collectors spot immediately.
The Financial Cost
A rare coin worth 50,000 rupees in its original uncleaned state might struggle to sell for 10,000 rupees if harshly cleaned. If your coin has loose dirt only soak it in distilled water or pure acetone and let it air dry without rubbing.