For both Formula 1s & Formula 2, everyone's tattoo will have its own unique shade, though it will always be black/dark navy. We're not putting an ink on top of your skin, but rather sinking a formula into your skin. The color you see is the result of a chemical reaction.
For the same reason, different areas of the body result in slightly different shades. Typically, the lighter the skin the lighter the tattoo and vice versa.