Terranova2.1 is a highly saturated silver ruby. It is capable of blues, greens, purples, reds and browns. The colors are dependent on the heat treatment given. Working hotter or colder, doing a lot of shaping or a little, all of these and more will affect the color.
Terranova 2.1 Dark is a batch of Terranova 2.1 that was darker than the color matching test it needs to pass.
Reset, cool and strike.