In 1953, Joseph Weiner, an Oxford professor of physical anthropology, met Kenneth Oakley at a banquet. They got chatting about the Piltdown puzzle and Weiner couldn't get it out of his mind. He had reports on the research and casts of the fossils and began examining each minutely. He was amazed to see that the fossil teeth seemed to have been deliberately ground down with something abrasive to give them a unique wear pattern. He called Oakley, who had access to the real fossils and asked him to look at them with a magnifier. He too became convinced the teeth had been purposely changed to fit the Piltdown Man. Weiner and Oakley now undertook new chemical analyses, including an improved fluorine test, and found that the jaw and teeth were not the same age as the skull and were not even fossils, just old bones. Some of the bones had been stained with chemicals and some with ordinary paint to make them match each other and the color of the soil where they were found. Weiner, Oakley, and Oxford anthropologist Wilfrid Le Gros Clark were now certain that the Piltdown fossil collection was a fake, and not just that, but a hoax.