http://www.guardian.co.uk/books/2009/nov/05/josette-baujot-obituary
(includes photo)
Excerpt:
"Hergé himself had the idea of a red-and-white chequered rocket,"
Baujot said, "but he asked me to add a little green in the red so that
it did not appear too violent. And he was insistent on orange
spacesuits for Tintin, Captain Haddock and Milou [Snowy, Tintin's fox
terrier]. For the surface of the moon, he gave me carte blanche but,
as it turned out, I opted for yellow, with the craters more
emphasised. In those days, we didn't know what the surface of the moon
looked like." Hergé was said to have been delighted with her
yellowish, light-mustard colouring of the moon's surface.
Lenona.