 In the 1946 colour version , Hergé added a cameo appearance from Thomson and Thompson , the two detectives that he had introduced in the fourth Tintin story , Cigars of the Pharaoh ( 1932 – 34 ) , which was <unk> set after the Congolese adventure . Adding them to the first page , Hergé featured them in the backdrop , watching a crowd surrounding Tintin as he boards a train and commenting that it " Seems to be a young reporter going to Africa ... " In the same frame , Hergé inserted depictions of himself and his friend Edgar P. <unk> ( the book 's colourist ) into the crowd seeing Tintin off . 
