You don't use black cuffs or collar but one that does contrast with her skin. Also doing any dissaplin of (whipping) you still don't do damage adn on a black girl you have to be more carfull just for the reason it is harder to see the whip marks. For a caucation Master finding and having a black slave is't a reason to brutalise a slave but it is for the felling of competion as a caucation Master or Mistress. One or more of the same race just does not cover it. But slaves of different races not just blace but all does.