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The spark spectrum of gold has been mapped by A. Kirchhoff, R. Thal�n, Sir William Huggins and H. Kr�ss; the brightest lines are 6277, 5960, 5955 and 5836 in the orange and yellow, and 5230 and 4792 in the green and blue.

Gallium is best detected by means of its spark spectrum, which gives two violet lines of wave length 4171 and 4031.

The salts have a faint pink colour, and show a faint absorption spectrum; the spark spectrum is brilliant and well characterized.

The salts of praseodymium are green in colour, and give a characteristic spark spectrum.