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  2. Colorimetry - Wikipedia

    en.wikipedia.org/wiki/Colorimetry

    Colorimetry is "the science and technology used to quantify and describe physically the human color perception". [1] It is similar to spectrophotometry, but is distinguished by its interest in reducing spectra to the physical correlates of color perception, most often the CIE 1931 XYZ color space tristimulus values and related quantities.

  3. Spectral color - Wikipedia

    en.wikipedia.org/wiki/Spectral_color

    A rainbow is a decomposition of white light into all of the spectral colors. Laser beams are monochromatic light, thereby exhibiting spectral colors. A spectral color is a color that is evoked by monochromatic light, i.e. either a spectral line with a single wavelength or frequency of light in the visible spectrum, or a relatively narrow spectral band (e.g. lasers).

  4. Spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Spectroscopy

    An example of spectroscopy: a prism analyses white light by dispersing it into its component colors. Spectroscopy is the field of study that measures and interprets electromagnetic spectra. [1] [2] In narrower contexts, spectroscopy is the precise study of color as generalized from visible light to all bands of the electromagnetic spectrum.

  5. Rainbow - Wikipedia

    en.wikipedia.org/wiki/Rainbow

    A secondary rainbow, at a greater angle than the primary rainbow, is often visible. The term double rainbow is used when both the primary and secondary rainbows are visible. In theory, all rainbows are double rainbows, but since the secondary bow is always fainter than the primary, it may be too weak to spot in practice.

  6. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    Spectral colors (colors that are produced by a narrow band of wavelengths) such as red, orange, yellow, green, cyan, blue, and violet can be found in this range. These spectral colors do not refer to a single wavelength, but rather to a set of wavelengths: red, 625–740 nm; orange, 590–625 nm; yellow, 565–590 nm; green, 500–565 nm; cyan ...

  7. Hair type chart: How to find your hair type, from straight 1A ...

    www.aol.com/lifestyle/hair-type-chart-hair-type...

    The original hair type chart, also known as the hair typing system, was created by Andre Walker, Oprah Winfrey's hairstylist, in the 1990s. He debuted the system on Winfrey's show to promote his ...

  8. Human hair color - Wikipedia

    en.wikipedia.org/wiki/Human_hair_color

    The Fischer–Saller scale, named after Eugen Fischer and Karl Saller is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: A (very light blond), B to E (light blond), F to L (), M to O (dark blond), P to T (light brown to brown), U to Y (dark brown to black) and Roman numerals I to IV and V to VI (red-blond).

  9. Guess What? Finding Hair In Food Isn't That Bad For You - AOL

    www.aol.com/food/guess-what-finding-hair-food...

    Maria Colavincenzo, a dermatologist at Northwestern who specializes in the study of hair explains that hair is made of a protein called keratin, which doesn't cause problems to the body if ingested.