Black Stain Removal

There are several methods used to clean ancient coin. I will go over my method. I'm sure others have different methods. The first thing I do when I get unclean coins is to remove the loose dirt by washing the coins in warm water with a little mild soap added. The coins are than rinsed and dried. Next the coins are soaked in extra virgin olive oil to loosen the caked on dirt, this may take anywhere from a few days to several months. My next step can be dangerous and could damage the coin if your not very very careful. I use fine dental tools to remove more of the caked on dirt. I than ultrasound the coins in distilled water which removes more or the dirt and lastly I let the coins soak in distilled water for a week or so. The objective is to remove as much dirt as possible without damaging the patina or destroying the coin. Cleaning ancient coins is not a quick process, it takes time and patients to do it right.

Thank you echizento and unknown95

thanks sap, the lower pic being silver is a surprise for me because of its color-brown. Looking at the pics again with image alteration in mind, I do tend to agree, that's probably why coins just seems to appear so "clean". thanks again!