From Terraria Wiki
Black Dye is a basic dye used to tint the player's armor or vanity items a deep black color. It is made at a Dye Vat using Black Ink, which is dropped by Squids. It can be used alone or to craft a combined or compound dye.
- If the black dye is equiped to Flame Wings the wings will appear pearly white, which can make people mistake them for Ghost or Frozen Wings.