The Case of the Bloody Iris (Italian: Perché quelle strane gocce di sangue sul corpo di Jennifer?, lit. "Why those strange drops of blood on Jennifer's body?", originally released in the UK as Erotic Blue) is a 1972 Italian giallo film directed by Giuliano Carnimeo, identified in the credits as Anthony Ascott. The film was referred to as "never boring" and "a competent thriller which offers enough violence and sex to satisfy the most ardent giallo fan".

In 2015, a novelization of the film by Michael R. Hudson was published in the United States by Raven Head Press as part of a series of adaptations of several of Gastaldi's scripts, including The Horrible Dr. Hichcock and My Name is Nobody.