 In the 1940s , after Hergé 's popularity increased , he <unk> many of the original black @-@ and @-@ white Tintin stories in colour using the ligne claire ( " clear line " ) drawing style he had developed , so that they fitted in visually with the newer Adventures of Tintin that he had produced . Hergé first made some changes in this direction in 1940 , when the story was serialised in the Flemish @-@ language Het <unk> <unk> . 
