Titanium dichloride, TiC1 21 obtained by passing hydrogen over the trichloride at a dull red heat, is a very hygroscopic brown powder which inflames when exposed to air, and energetically decomposes water.
It readily inflames, burning with a blue smokeless flame, and producing water and carbon dioxide, with the evolution of great.
The term "spontaneous combustion" is used when a substance smoulders or inflames apparently without the intervention of any external heat or light; in such cases, as, for example, in heaps of cotton-waste soaked in oil, the oxidation has proceeded slowly, but steadily, for some time, until the heat evolved has raised the mass to the temperature of ignition.
But the connexion is clear, and hence it also explained the curious Gnostic myth mentioned above, namely that the i carnip (the light-maiden) by appearing to the archontes (cipxovrES), the lower powers of this world, inflames them to sexual lusts, in order to take from them that share of light which they have stolen from the upper world.
It is very heavy, its density being about 11; it inflames when heated in air and is not attacked by alkalis; it readily dissolves in nitric acid and aqua regia, but with difficulty in hydrochloric acid.
Many compounds containing hydrogen are readily decomposed by the gas; for example, a piece of paper dipped in turpentine inflames in an atmosphere of chlorine, producing hydrochloric acid and a copious deposit of soot; a lighted taper burns in chlorine with a dull smoky flame.
It is a very powerful oxidant; a mixture of potassium chlorate and sugar in about equal proportions spontaneously inflames when touched with a rod moistened with concentrated sulphuric acid, the chlorine peroxide liberated setting fire to the sugar, which goes on burning.
Guntz, Comptes rendus, 1896, 122, p. 2 44; 12 3, p. 1273) is a white solid which inflames when heated in chlorine.
With the other elements it unites to form bromides, often with explosive violence; phosphorus detonates in liquid bromine and inflames in the vapour; iron is occasionally used to absorb bromine vapour, potassium reacts energetically, but sodium requires to be heated to 200° C. The chief use of bromine in analytical chemistry is based upon the oxidizing action of bromine water.
It crystallizes in colourless cubes, is deliquescent, and often inflames spontaneously on exposure to air.
It deliquesces and oxidizes on exposure, inflames in dry chlorine and is reduced to ammonia by zinc dust.
When strongly heated iron inflames in oxygen and in sulphur vapour; it also combines directly with the halogens.
It spontaneously inflames in air or oxygen; and when the gas is issuing from a jet into air the flame is greyish green, with a faintly luminous and yellow tip; the flame is probably one of the coldest known.