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Whereas the tetroxide produced by distillation is unstable, particularly in the presence of organic compounds such as ethanol, when it is thoroughly dry, it can be kept in the dark in sealed tubes without any evidence of decomposition. In the early nineteenth century, it was reported that heating ruthenium in oxygen at 958°C produced the tetroxide, which could be condensed in a flask cooled in ice.  suggested that Ru0 4 was formed above 1425°C in air. To account for weight losses when 0-2 g of metal was subjected to a differential thermal analysis, they stated: " Oxidation of Ru0 2 to Ru0 4 vapor must, therefore, occur at a rapid rate at 1400-1500°C accompanied by the gas phase decomposition of Ru0 4 at temperatures above 1425°C ".
Compounds such as RhZn 2 , Rh 3 Zn 2 and hexagonal prisms of a ruthenium-zinc compound, have been reported. Fused mixtures of zinc and platinum have been stated to contain PtZn, PtZn 2 , Pt 2 Zn 3 . Zinc alloys with both palladium and iridium have also been reported. Few of these products have been isolated as pure substances. g. platinum, may result in finely powdered metal which may be explosive on treatment with acids. The fusion may be accomplished in a quartz crucible at about 800°C. The metal is mixed with about 10 parts of powdered zinc, preferably free of lead, and covered with zinc chloride.
RHODIUM Rhodium metal at high gas temperatures in air or oxygen oxidizes to form rhodium(III) oxide. In spite of early contradicting data suggesting the existence of lower oxides, there is little doubt that the only product of oxidation up to about 1000°C is R h 2 0 3 . This oxide cannot be used as a weighing form, however, because even as little as 100 mg of rhodium sponge ACIDS, BASES, OXYGEN AND CHLORINE ON NOBLE METALS 33 may require many hours of heating to reach the composition of R h 2 0 3 .