The Black Talons is a Loyalist Space MarineChapter of unknown origins and Founding. Beyond its simple existence, nothing else is known about it in Imperial records.
The Black Talons Chapter primarily wears bone-white Power Armour. The trim of the shoulder plates as well as the upper torso and groin areas are black. The black squad specialty symbol -- Tactical, Assault, Devastator or Veteran -- is indicated on the right shoulder plate. A white Gothic numeral centred on the squad specialty symbol indicates squad number. The colour of the Aquila or Imperialis on the chest indicates company number in accordance with the Codex -- i.e. White (1st Company), Yellow (2nd Company), Red (3rd Company), etc.
The Black Talons' Chapter badge is a large raptor's talon centred on a field of bone-white.
Adeptus Astartes: Successor Chapters (Limited Release Booklet), pg. 17