Black Tulip
In one story, "De Zwarte Tulp" ("The Black Tulip") (2014) he becomes temporarily cured of his evilness by drinking a serum extracted from a white tulip. However, since Krimson feels so much remorse for his past he is unable to eat, drink or sleep anymore. Fearing for his health Suske, Wiske and Lambik travel back in time to 1637 to find a black tulip as an antidote. At the end of the story Krimson's butler Achiel refuses to balance the white and black tulip serums out and only feeds his master the black serum, making Krimson evil again.