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  2. Colloidal gold - Wikipedia

    en.wikipedia.org/wiki/Colloidal_gold

    Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. [1] The colloid is coloured usually either wine red (for spherical particles less than 100 nm ) or blue-purple (for larger spherical particles or nanorods ). [ 2 ]

  3. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    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 ...

  4. Heterochromia iridum - Wikipedia

    en.wikipedia.org/wiki/Heterochromia_iridum

    Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism ...

  5. Corneal tattooing - Wikipedia

    en.wikipedia.org/wiki/Corneal_tattooing

    Honey-gold color. Corneal tattooing (or keratopigmentation) is the practice of tattooing the cornea of the human eye. Reasons for this practice include improvement of cosmetic appearance and the improvement of sight. Many different methods and procedures exist today, and there are varying opinions concerning the safety or success of this practice.

  6. Red pigments - Wikipedia

    en.wikipedia.org/wiki/Red_pigments

    Red pigments are materials, usually made from minerals, used to create the red colors in painting and other arts. The color of red and other pigments is determined by the way it absorbs certain parts of the spectrum of visible light and reflects the others. The brilliant opaque red of vermillion, for example, results because vermillion reflects ...

  7. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    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. Colored golds can be classified in three groups: [2] Alloys with silver and copper in ...

  8. Ochre - Wikipedia

    en.wikipedia.org/wiki/Ochre

    Ochre pigment. Ochre (/ ˈoʊkər / OH-kər; from Ancient Greek ὤχρα (ṓkhra), from ὠχρός (ōkhrós) 'pale'), iron ochre, or ocher in American English, is a natural clay earth pigment, a mixture of ferric oxide and varying amounts of clay and sand. [ 1 ] It ranges in colour from yellow to deep orange or brown. It is also the name of ...

  9. Toluidine red - Wikipedia

    en.wikipedia.org/wiki/Toluidine_red

    Toluidine red is an organic compound with the formula C10H6(OH) (N2C6H3(NO2)CH3). A dark red solid, the compound is classified as a azo dye consisting of a 2-naphthol group linked to a 2-nitro-4-methylphenyl substituent. [3] Toluidine red is a traditional pigment, found in oil paints. [4] Although once popular, it suffers as a pigment owing to ...

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