KA:BLACK STERLING. Black Sterling is a surface oxidation of sterling silver. This finish may fade over time, which can be considered an enhancement. Please note that Black Sterling tends to appear darker in photograph than in person.
The finish can be blackened easily with Liver of Sulfur, available at most jewelry suppliers.
KZ:BLACK BRONZE. Heat treated, blackened white bronze. This finish will fade over time, which can be considered an enhancement.
This is an irregular, uneven finish and will differ from the photograph. For a cleaner, polish black finish, consider KA (Black Sterling).