VF Rainbow toning Septimius Severus Victory rx. Rome mint denarius Silver coins also can take on a multicolored hue. This also can be chemically induced. Patinas can be found in a range of colors. Green is common and popular.
Green patinas come in a range of shades from light olive to almost black.
Black is a commonly found color and looks better on the coin than on a photo. F Red Patina Tiberius altar rx. as Red patina is commonly found as spots on coins of other colors but sometimes covers enough of the coin to be classified separately. Blue is a less common color but still popular. Perhaps it would be good to note that certain soils tend to produce certain color patinas so some issues are commonly found with a particular color and rarely found with others. VF Earthen Patina Constantius II Spearing rx.