heres some more qoutes i found:
"But what was the mysterious "Xerum 525"? When first investigating this strange material, the first thought is that it might be some radioactive isotope of mercury, or possibly a more radioactive substance in chemical solution of some sort. It is perhaps worth noting that recently a strange substance known as "red mercury", or mercury antominate oxide, has been alleged to have strong neutron emitting properties when subjected to sudden explosive stress, and is alleged to be a non-fissile method of triggering the enormous fusion reactions of hydrogen bombs, as well as being able, in its own right, of fission explosions in the small kiloton range. Perhaps the Nazis had stumbled onto a similar such substance during the war. "