Red mercury is a discredited substance, most likely a hoax perpetrated by con artists who sought to take advantage of gullible buyers on the black market for arms. These con artists described it as a substance used in the creation of nuclear weapons; because of the secrecy surrounding nuclear weapons development, it is difficult to disprove their claims completely. However, all samples of alleged "red mercury" analyzed in the public literature have proven to be well-known, common substances of no interest to weapons makers.
History References to red mercury first appeared in major Soviet and western media sources in the late 1980s. The articles were never specific as to what exactly red mercury was, but nevertheless claimed it was of great importance in nuclear bombs, or that it was used in the building of boosted fission weapons. Almost as soon as the stories appeared, people started attempting to buy it. At that point, the purported nature of the substance started to change, and eventually turned into anything the buyer happened to be interested in. As New Scientist reported in 1992, a Lawrence Livermore National Laboratory report outlined that:
When red mercury first appeared on the international black market 15 years ago, the supposedly top secret nuclear material was 'red' because it came from Russia. When it resurfaced last year in the formerly communist states of Eastern Europe it had unaccountably acquired a red colour. But then, as a report from the US Department of Energy reveals, mysterious transformations are red mercury's stock in trade.
The report, compiled by researchers at the Los Alamos National Laboratory, shows that in the hands of hoaxers and conmen, red mercury can do almost anything the aspiring Third World demagogue wants it to. You want a short cut to making an atom bomb? You want the key to Soviet ballistic missile guidance systems? Or perhaps you want the Russian alternative to the anti-radar paint on the stealth bomber? What you need is red mercury.
A 1993 article in the Russian newspaper Pravda, claiming to be informed by leaked top-secret memos, described red mercury as:
[A] super-conductive material used for producing high-precision conventional and nuclear bomb explosives, 'Stealth' surfaces and self-guided warheads. Primary end-users are major aerospace and nuclear-industry companies in the United States and France along with nations aspiring to join the nuclear club, such as South Africa, Israel, Iran, Iraq, and Libya.
Two TV documentaries about red mercury were made by British Channel 4 television, airing in 1993 and 1994; Trail of Red Mercury and Pocket Neutron, which claimed to have "startling evidence that Russian scientists have designed a miniature neutron bomb using a mysterious compound called red mercury".
Samuel T. Cohen, an American physicist who worked on building the atomic bomb, said in his autobiography that red mercury is manufactured by "mixing special nuclear materials in very small amounts into the ordinary compound and then inserting the mixture into a nuclear reactor or bombarding it with a particle-accelerator beam." When detonated, this mixture allegedly becomes "extremely hot, which allows pressures and temperatures to be built up that are capable of igniting the heavy hydrogen and producing a pure-fusion mini neutron bomb."
Red mercury was offered for sale throughout Europe and the Middle East by Russian businessmen, who found many buyers who would pay almost anything for the substance, even though they had no idea what it was. A study for the Bulletin of the Atomic Scientists published in 1997 has perhaps the most factual summary of red mercury:
The asking price for red mercury ranged from $100,000 to $300,000 per kilogram. Sometimes the material would be irradiated or shipped in containers with radioactive symbols, perhaps to convince potential buyers of its strategic value. But samples seized by police contained only mercury(II) oxide, mercury(II) iodide, or mercury mixed with red dye – hardly materials of interest to weapons-makers.
Following the arrest of several men in Britain in September 2004, on suspicion that they were trying to buy a kilogram of red mercury for £900,000, the International Atomic Energy Agency made a statement dismissing claims that the substance is real. "Red mercury doesn't exist," said the spokesman. "The whole thing is a bunch of malarkey." When the case came to trial at the Old Bailey in April 2006, it became apparent that News of the Worlds "fake sheikh" Mazher Mahmood had worked with the police to catch the three men (Dominic Martins, Roque Fernandes and Abdurahman Kanyare). They were tried for "trying to set up funding or property for terrorism" and "having an article (a highly dangerous mercury-based substance) for terrorism". According to the prosecutor, red mercury was believed to be a material which could cause a large explosion, possibly even a nuclear reaction, and whether or not red mercury actually existed was irrelevant to the prosecution. All three men were acquitted in July 2006.
Analysis Several common mercury compounds are indeed red, such as mercury sulfide (from which the bright-red pigment vermilion was originally derived), mercury(II) oxide (historically called red precipitate), and mercury(II) iodide. No use for any of these compounds in nuclear weapons has been publicly documented. "Red mercury" could also be a code name for a substance that contains no mercury at all.
A variety of different items have been chemically analyzed as putative samples of "red mercury" since the substance first came to the attention of the media, but no single substance was found in these items. A sample of radioactive material was seized by German police in May 1994. This consisted of a complex mixture of elements, including about 10% by weight plutonium, with the remainder consisting of 61% mercury, 11% antimony, 6% oxygen, 2% iodine and 1.6% gallium. The reason why somebody had assembled this complex mixture of chemicals is unknown; equally puzzling was the presence of fragments of glass and brush bristles, suggesting that someone had dropped a bottle of this substance and then swept it up into a new container.
In contrast, an analysis reported in 1998 of a different "red mercury" sample concluded that this sample was a non-radioactive mixture of elemental mercury, water and mercury(II) iodide, which is a red colored chemical. Similarly, another analysis of a sample recovered in Zagreb in November 2003 reported that this item contained only mercury. One formula that had been claimed previously for red mercury was Hg2Sb2O7 (mercury(II) pyroantimonate), but no antimony was detected in this 2003 sample.
Explanations Red mercury was described by many commentators, and the exact nature of its supposed working mechanism varied widely among them. In general, however, none of these explanations appear to be scientifically or historically supportable.
Background Traditional staged thermonuclear weapons consist of two parts, a fission "primary" and a fusion/fission "secondary". The energy released by the primary when it explodes is used to (indirectly) compress the secondary and start a fusion reaction within it. Conventional explosives are far too weak to provide the level of compression needed.
The primary is generally built as small as possible, because the energy released by the secondary is much larger, and thus building a larger primary is generally inefficient. There is a lower limit on the size of the primary, known as the critical mass. For weapons grade plutonium, this is around . This can be reduced through the use of neutron reflectors or clever arrangements of explosives to compress the core, but these methods generally add to the size and complexity of the resulting device.
Because of the need for a fission primary and the difficulty of purifying weapons-grade fissile materials, the majority of arms control efforts to limit nuclear proliferation rely on the detection and control of the fissile material and the equipment needed to obtain it.
Shortcut to fissionable material A theory popular in the mid-1990s was that red mercury facilitated the enrichment of uranium to weapons-grade purity. Conventionally, such enrichment is usually done with Zippe-type centrifuges, and takes several years. Red mercury was speculated to eliminate this costly and time-consuming step. Although this would not eliminate the possibility of detecting the material, it could escape detection during enrichment as the facilities hosting centrifuges normally used in this process are large and require equipment that can be fairly easily tracked internationally. Eliminating such equipment would in theory greatly ease the construction of a clandestine nuclear weapon.
Shortcut to fusible material A key part of the secondary in a fusion bomb is lithium-6-deuteride. When irradiated with high-energy neutrons, Li-6 creates tritium, which mixes with the deuterium in the same mixture and fuses at a relatively low temperature. Russian weapon designers have reported (1993) that red mercury was the Soviet codename for lithium-6, which has an affinity for mercury and tends to acquire a red colour due to mercuric impurities during its separation process.
Red mercury as a ballotechnic Samuel T. Cohen, the "father of the neutron bomb", claimed for a long time that red mercury is a powerful explosive-like chemical known as a ballotechnic. The energy released during its reaction is allegedly enough to directly compress the secondary without the need for a fission primary in a thermonuclear weapon. He claimed that he learned that the Soviet scientists perfected the use of red mercury and used it to produce a number of softball-sized pure fusion bombs weighing as little as , which he claimed were made in large numbers.
He went on to claim that the reason this is not more widely known is that elements within the US power structure are deliberately suppressing or hiding information due to the frightening implications such a weapon would have on nuclear proliferation. Since a red mercury bomb would require no fissile material, it would seemingly be impossible to protect against its widespread proliferation given current arms control methodologies. Instead of trying to do so, they simply claim it does not exist, while acknowledging its existence privately. Cohen also claimed that when President Boris Yeltsin took power, he secretly authorized the sale of red mercury on the international market, and that fake versions of it were sometimes offered to gullible buyers.
Critics argue Cohen's claims are difficult to support scientifically. The amount of energy released by the fission primary is thousands of times greater than that released by conventional explosives, and it appears that the "red mercury" approach would be orders of magnitude smaller than required.
Additionally, it appears there is no independent confirmation of any sort of Cohen's claims to the reality of red mercury. The scientists in charge of the labs where the material would have been made have publicly dismissed the claims (see below), as have multiple US colleagues, including Edward Teller.
According to Cohen, veteran nuclear weapon designer Frank Barnaby conducted secret interviews with Russian scientists who told him that red mercury was produced by dissolving mercury antimony oxide in mercury, heating and irradiating the resultant amalgam, and then removing the elemental mercury through evaporation. The irradiation was reportedly carried out by placing the substance inside a nuclear reactor.
Stealth paint