Oxidizing with Silver Black

Here is the same charm after I oxidized it and then also polished some of it off. I used a flexible shaft and polishing attachment to polish the charm. I was careful to just polish the surface and not try to polish the grooves. This way the lines or grooves in the charm have some black in them, and this black color helps the details stand out.

Unless you want your piece to be completely black, you will need to polish it some afterwards. You can use a flexible shaft like I did, use a polishing cloth, or try any number of other polishing methods. But,the idea is to just get some of it off, not all of it, so the details pop out.