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Indium, in′di-um, n. a soft malleable silver-white metallic element.
Precipitation with sulphuretted hydrogen does not give exact results on account of the solubility of the indium sulphide.
In properties gallium is more or less intermediate between the metals aluminium and indium.
Indium, a metallic elementary body of rare occurrence, and first discovered in zinc-blende in 1863.The Nuttall Encyclopaedia|Edited by Rev. James Wood
When examined by means of the spectroscope, the flame of indium reveals two brilliant bands—a violet and a blue one.