• Sonja Hanebaum
  • Klaus Ruppersberg
  • Renate Peper-Bienzeisler
Some of the substances in our environment are colorfully perceived - not only by humans - for example, insects with their faceted eyes look a bit different and have a wider field of vision into the UV range, and bulls like to go right when they see red. Have you ever thought about why you see flowers, rainbows, neon tubes or painted surfaces in color? The colors of bricks (red pigment, reflection), red ink (red dye, absorption) or red gold nanoparticles (scattering) are based on different laws. There are materials that shine through the absorption of light itself. For example, optical brighteners in detergents and by phosphorescence, the times on wristwatches are also readable at night.
The physical cause of the color are electromagnetic waves, as they are used in broadcasting or X-rays. If white light is passed through a prism, the result is a phenomenon (phenomenon lat .: spectrum), namely the splitting of the white light into its constituents by different diffraction of different wavelengths. If this spectrum is regarded (ancient Greek: scopein), it is called spectroscopy. If spectra are measured, this is called spectrometry. If this measurement, e.g. a solution of bromothymol blue in water, is ranging from 325 nm to 650 nm, it is UV-Vis spectrometry.

Original languageGerman
JournalChemie konkret: CHEMKON; Forum für Unterricht und Didaktik
Issue number5
Pages (from-to)215-216
Number of pages2
Publication statusPublished - 05.08.2019

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