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  2. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Colored gold. Ternary plot of different colors of Ag – Au – Cu alloys. Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [1] but colored gold can come in a variety of different colors by alloying it with different elements.

  3. Limbal ring - Wikipedia

    en.wikipedia.org/wiki/Limbal_ring

    A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2] The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral ...

  4. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3] : 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in ...

  5. Halo (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Halo_(optical_phenomenon)

    Halo (optical phenomenon) A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.

  6. Olympic symbols - Wikipedia

    en.wikipedia.org/wiki/Olympic_symbols

    Rings. The five-ringed symbol of the Olympic Games. The first five-ringed symbol of the Olympic Games used between 1913 and 1986. The second five-ringed symbol of the Olympic Games used between 1986 and 2010. There are five interlocking rings, coloured blue, yellow, black, green, and red on a white field.

  7. Phosphene - Wikipedia

    en.wikipedia.org/wiki/Phosphene

    Phosphene. An artist's representation of how some people may see phosphenes by retinal stimulation. A phosphene is the phenomenon of seeing light without light entering the eye. The word phosphene comes from the Greek words phos (light) and phainein (to show).