Ivory Black or Bone Black
“Ivory Black is semi-transparent. It has a moderate tinting strength, so it doesn’t overwhelm mixtures, making it a good all-around mixing black. If you like Ivory Black, but find that it dulls mixtures a bit too much, consider Chromatic Black.” -Gamblin Oils. More information can be found at: https://gamblincolors.com/choosingblackoilpaint/