In a statistical sense, elastic scattering of light by numerous particles much smaller than the wavelength of the light is a process known as Rayleigh scattering while the similar process for scattering by particles that are similar or larger in wavelength is known as Mie scattering with the Tyndall effect being a commonly observed result.
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During sunrise and sunset, sunlight is attenuated because of Rayleigh scattering and Mie scattering from a particularly long passage through Earth's atmosphere, and the Sun is sometimes faint enough to be viewed comfortably with the naked eye or safely with optics ( provided there is no risk of bright sunlight suddenly appearing through a break between clouds ).
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One possible explanation for the difference in the appearance of gray and blue eyes is that gray eyes have larger deposits of collagen in the stroma, so that the light that is reflected from the epithelium undergoes Mie scattering ( which is not strongly frequency-dependent ) rather than Rayleigh scattering ( in which shorter wavelengths of light are scattered more ).
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I'm going with the idea of nanocopper-- you reduced Cu ( II ) to Cu ( I ) only to have it disproportionate into Cu ( II ) and Cu ( 0 ) . ( And the Cu ( II ) gets reduced again into Cu ( I ) . . . ) And colloidal copper is much different than bulk copper . . . . because of different surface energies and the Mie scattering it will take on a different colour . . . welcome to nanochemistry ! talk ) 15 : 54, 2 July 2010 ( UTC)
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Can Mie Scattering have a > 1 % effect on UV-Vis measurements of nanoporous membranes ? ( Pores are 200nm in diameter and . 5mm long, centers ~ 500nm apart, alumina membrane refractive index = 1.6 ) There are papers that analytically take Generalized Mie Theory from spheres to infinitely long ellipsoids ( taken to be cylinders ), but I not only cannot interpret the purely theoretical papers but I also am unsure of whether the " lack " of a cylinder scatters in a similar fashion as an actual cylinder ( I assume so-- just switch the indices of refraction of the solid and air ).
