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2. 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 the ...

3. Anthocyanin - Wikipedia

   en.wikipedia.org/wiki/Anthocyanin

   Anthocyanins (from Ancient Greek ἄνθος (ánthos) 'flower' and κυάνεος / κυανοῦς (kuáneos/kuanoûs) 'dark blue'), also called anthocyans, are water-soluble vacuolar pigments that, depending on their pH, may appear red, purple, blue, or black. In 1835, the German pharmacist Ludwig Clamor Marquart named a chemical compound ...

4. Titanium dioxide - Wikipedia

   en.wikipedia.org/wiki/Titanium_dioxide

   Titanium dioxide, also known as titanium(IV) oxide or titania / t aɪ ˈ t eɪ n i ə /, is the inorganic compound derived from titanium with the chemical formula TiO 2.When used as a pigment, it is called titanium white, Pigment White 6 (PW6), or CI 77891. [4]

5. Carotenoid - Wikipedia

   en.wikipedia.org/wiki/Carotenoid

   Carotenoid. Chemical structure of β- carotene, a common natural pigment. Carotenoids (/ kəˈrɒtɪnɔɪd /) are yellow, orange, and red organic pigments that are produced by plants and algae, as well as several bacteria, archaea, and fungi. [1] Carotenoids give the characteristic color to pumpkins, carrots, parsnips, corn, tomatoes, canaries ...

6. Blood–ocular barrier - Wikipedia

   en.wikipedia.org/wiki/Blood–ocular_barrier

   Blood–ocular barrier. The blood–ocular barrier is a barrier created by endothelium of capillaries of the retina and iris, ciliary epithelium and retinal pigment epithelium. [1] It is a physical barrier between the local blood vessels and most parts of the eye itself, and stops many substances including drugs from traveling across it. [2]

7. Cochineal - Wikipedia

   en.wikipedia.org/wiki/Cochineal

   The 16th century Florentine Codex contains a variety of illustrations with multiple variations of the red pigments. Specifically in the case of achiotl (light red), technical analysis of the paint reveals multiple layers of the pigment although the layers of the pigment is not visible to the naked eye. Therefore, it proves that the process of ...