2, #302 (December 1984) reintroduced the grey Hulk in flashbacks established close to the origin story. An exception could be the early trade paperback, Origins of Marvel Comics, from 1974, which explains the problems in preserving the grey colour dependable inside a Stan Lee prepared prologue, and reprints the origin http://banner-printing-den49493.pointblog.net/Fascination-About-banner-CO-36547453