Cauldron of Blood (also known as Blind Man's Buff) is a 1971 horror film filmed in Spain and directed by Edward Mann. It stars Boris Karloff and Viveca Lindfors. The original Spanish release title was El Coleccionista de cadáveres (The Corpse Collector).
The film was made in 1967 but released after the deaths of both star Karloff and director Mann in 1971. Karloff plays a blind sculptor, Charles Badulescu, who uses the bones of real people in the creation of his art.
It was released on VHS and region 0 DVD in the United Kingdom and included the episode The Silver Curtain from Karloff's 1954 TV series Colonel March of Scotland Yard.