The color Charleston green originated after the American Civil War, when the North provided black paint to the South for use in its reconstruction. Charlestonians, i.e., the inhabitants of Charleston, South Carolina, mixed the black with a little bit of yellow and blue and created Charleston green. Since this color has a hue code of 180, it is actually an extremely dark shade of cyan.
This color looks black unless the sun hits it just right, and then the color registers a very dark forest green. From Rust-Oleum paint company it is color No. 214086 but still looks black on color cards.