Depending on the santero, black magic or witchcraft can be used but is not prevalent. Palo Monte or Palo Mayombe is the practice of black magic or witchcraft, and even Satanism.
There is also good Palo or Christian Mayome, and bad, or Jewish or unbaptized Mayombe. With Palo or Christian Mayome, holy water is used. In the Jewish or unbaptized Mayombe there arwe participants who have not been baptized into the Catholic Church, or who might be Jewish or some other religion that does not recognize the Church.