W. Ehrich and G. M. Henderson note, “To those who are not completely disillusioned by the work of their predecessors, the disqualification of the Piltdown skull changes little in the broad evolutionary pattern.The validity of the specimen has always been questioned.” Eventually, during the 1940s and 1950s, more advanced dating technologies, such as the fluorine absorption test, proved scientifically that this skull was actually a fraud.