How to remove the copper patina?
The money for the corrosion caused by the unclear can eat vinegar, such as sulfuric acid soaking, soaking should be kept flipping, observation, not overdo sth. then wash, soft brush, clean and dry. Ancient coins rust, in general, it is best not to use physical means, or even for cleaning out goods are being destroyed.
Ancient coins are generally formed to protect the surface rust, the rust protection, also known as the old rust, rust hard, green, blue, red. Can play its own role in the protection, it is best not to destroy. Real currency money into the deep patina, knife tick, boiled very difficult to remove, so it is best not to wash or removal.
Iron coins than easy oxidation, so the iron surface rust protection money, including those handed down the ancient colors, more attention should be paid to care, otherwise it will only promote its corrosion, has the opposite effect. Say old coins through the hundred years of vicissitudes, a patina is very normal, why don't you go? Verdigris is also an important point in identifying old coins, remove unfavorable depreciation may also be that it does!
