2, #302 (December 1984) reintroduced the grey Hulk in flashbacks established close to the origin story. An exception is the early trade paperback, Origins of Marvel Comics, from 1974, which describes the challenges in maintaining the grey coloration steady inside of a Stan Lee composed prologue, and reprints the origin https://johnnycfijj.therainblog.com/2255918/stand-up-banner-co-options