1944 on he helped him in the recasting of his earlier albums Tintin in the Congo, Tintin in America, King Ottokar's Sceptre and The Blue Lotus for color book publication. After the project, he continued to contribute directly in the drawing as well as the storyline for the new Tintin double-albums The Seven Crystal Balls/Prisoners of the Sun. Jacobs, as a fan of opera, decided to take Hergé with him to a concert. Hergé did not like opera, however, and for decades he would gently lampoon his friend Jacobs through the device of opera singer Bianca Castafiore, a supporting character in The Adventures of Tintin. Hergé also gave him tiny cameo roles in Tintin adventures, sometimes under the name Jacobini, for example in The Calculus Affair where Jacobini is the name of an opera singer advertised as starring alongside La Castafiore in Gounod's Faust, and as a mummified egyptologist on the cover of Cigars of the Pharaoh, as well as in the rewritten version. In a 1977 interview with the BBC (excerpted in 2016 on the Witness radio program/podcast), Hergé stated that Jacobs was part of his inspiration for the major character of Captain Haddock: "He [Jacobs] is just like Captain Haddock, full of movement...bursting into...invective." In 1946, Jacobs was part of the team gathered by Raymond Leblanc around the new Franco-Belgian comics magazine Tintin, where his story Le secret de l’Espadon (The Secret of the Swordfish) was published on 26 September, the first of the Blake and Mortimer series. In 1947, Jacobs asked to share the credit with Hergé on The Adventures of Tintin. When Hergé refused, their collaboration suffered a bit of a setback. Hergé still remained a friend however, and as before Blake et Mortimer continued to be serialised in Tintin magazine. In 1950, Jacobs published The Mystery of the Great Pyramid. Many others soon followed. Jacobs finally published in 1970 the first volume of The Three formulas of Professor Sato, which was staged in Japan. In 1973 he restyled his first full-length album, Le Rayon U, and wrote his autobiography under the title Un opéra de papier: Les mémoires de Blake et Mortimer. He then wrote the scenario for the second episode of Les Trois Formules du Professeur Sato, but the artwork remained unfinished at the time of his death. Bob de Moor was drafted in to complete the album, which was published in 1990. Jacobs