TKB Trading’s Brown Oxide
This flirts with being a warmish color, but it’s neutral enough that I can wear it without the color clashing (ever so gently) with my undertones. This is a straight colorant with minimal other ingredients, so it needs special application to go on and stay on. This can work as an eyeshadow or face color. It might work as a brow color, though you’d probably want at least a clear gel to hold the color in place.