Observe absorption lines in the Sun's spectrum, the spectra of energized elements in gaseous states and the double yellow lines of Mercury vapors in the spectrum of a fluorescent lamp.
The ready-to-assemble spectrometer comes with a strip of film and a scale from which a color may be identified by wavelength in nanometers or photon energy in electron volts. This product is recommended for astronomy, chemistry, physics, physical science and earth science at the high school through college level.