Christian Christiansen (9 October 1843 in Lønborg, Denmark – 28 November 1917 Frederiksberg) was a Danish physicist.

Christiansen first taught at the local polytechnical school.

Around 1917, he discovered the anomalous dispersion of numerous dyes, including aniline red (fuchsine), by recording absorption spectra.

Christiansen was elected a member of the Royal Swedish Academy of Sciences in 1902.

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