We’re coming out with black and other darker colors in a few weeks! You’re correct in assuming Inkodye works best on light fabrics. The color is subtractive and because it’s a dye it becomes part of the fabric itself, not a paint that sits on top.
Also note that the Lumi app has a fun augmented reality feature that allows you to see how the color of dye will blend with the color of shirt. This can yield some fun effects when printing one color on top of another.
