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  2. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    where E is the energy of the quantum , f is the frequency of the light wave, h is the Planck constant, λ is the wavelength and c is the speed of light. The relationships between the energies of the various quantum states are treated by atomic orbital , molecular orbital , Ligand Field Theory and Crystal Field Theory .

  3. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_page

    Site news – Sources of news about Wikipedia and the broader Wikimedia movement. Teahouse – Ask basic questions about using or editing Wikipedia. Help desk – Ask questions about using or editing Wikipedia. Reference desk – Ask research questions about encyclopedic topics. Content portals – A unique way to navigate the encyclopedia.

  4. Tekhelet - Wikipedia

    en.wikipedia.org/wiki/Tekhelet

    The Sifrei says that counterfeit tekhelet was made from both "[red] dye and indigo", indicating that the overall color was purple. [ c ] However, other sources list just "indigo" as the counterfeit, suggesting either that in their opinion the colour was purely blue, or that indigo was the main counterfeit ingredient and the other ingredients ...

  5. List of mainline My Little Pony ponies - Wikipedia

    en.wikipedia.org/wiki/List_of_mainline_My_Little...

    Twilight Sparkle (called Twilight) is an alicorn pony with a light purple body, deep purple eyes and a indgo-blue mane and tail with a purple and pink streak. She is the younger sister of Shining Armor and the sister-in-law of Princess Cadance, and is one of the Elements of Harmony.

  6. Tyrian purple - Wikipedia

    en.wikipedia.org/wiki/Tyrian_purple

    Variations in colours of "Tyrian purple" from different snails are related to the presence of indigo dye (blue), 6-bromoindigo (purple), and the red 6,6'-dibromoindigo. Additional changes in colour can be induced by debromination from light exposure (as is the case for Tekhelet ) or by heat processing. [ 36 ]

  7. History of red - Wikipedia

    en.wikipedia.org/wiki/History_of_red

    Red was the color worn by the royal guards of honor, and the color of the carriages of the imperial family. When the imperial family traveled, their servants and accompanying officials carried red and purple umbrellas. Of an official who had talent and ambition, it was said "he is so red he becomes purple." [7]: 26

  8. Red light camera - Wikipedia

    en.wikipedia.org/wiki/Red_light_camera

    Red light camera systems typically employ a sensor that detects the presence of a vehicle past the stop bar, and, in some cases, measures the speed of a vehicle at the time it ran the red light. The sensors may be single or dual inductive loops, piezoelectric strips, laser, radar or optical video analyses.

  9. Laser pointer - Wikipedia

    en.wikipedia.org/wiki/Laser_pointer

    Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.

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