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Tellurous Acid, TeO2. in the oxidizing flame.Dissolves to a clear colorless glass which, when treated on charcoal, becomes grey and dull from particles of reduced tellurium.

With carbonate of soda, tellurous acid fuses upon platinum wire to a clear colorless bead, which is white when cold.

If tellurous acid, finely powdered charcoal, and carbonate of soda are mixed together, and the mixture be well ignited in a closed tube, until fusion is effected, and a few drops of boiled water are brought into the tube, they are colored purple, indicating the presence of tellur-sodium.

Heated still more strongly, it becomes milk-white, oxygen is expelled, and it is converted into tellurous acid.

When heated upon charcoal in the oxidation flame, it melts, and is reduced to the metallic state, but volatilizes and a sublimate of white tellurous acid is formed upon the charcoal.