You can craft this potion with:
The following items use Black Blood :
- Novigrad- Sold by a halfling herbalist in Novigrad. South of Hierarch Square, and across the canal. Northwest of the Gate of the Hierarch.
- The manuscript for this potion is found on the following merchants: Keira Metz and Otto Bamber
Trivia or Notes about Black Blood
- "In the distant past, mages working with witchers developed this potion specifically for use in fighting cemetery and crypt dwellers that drink the blood or eat the innards of their still living victims. Witchers use Black Blood unwillingly because the potion only works when a monster begins to feast on their body. Their transmuted blood proves to be a deadly drink." Witcher 1 flavor text.