Dark Magic items are magical artifacts that contain sinister, dangerous magical powers. Some, like the Hand of Glory, simply give light, but are obviously created using evil magic; a Hand of Glory actually uses a real human hand, for example. Other Dark Magic items are cursed, like the opal necklace in Borgin and Burkes.
Some Of The Main Sources Of these artifacts are
Borgin and Burkes
No12 Gimmauld place
and so on.....................