The spectral dependency and polarization were measured for visible light scattered from polydisperse distributions of ice crystals grown in a laboratory cold chamber. Within the limits of experimental accuracy, there was no discernable spectral variation in the shape of the scattering diagram. The polarization was small but discernable, having a negative value in the region of the 22° halo and a broad positive peak near 115°.
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Paul J. Huffman (1970) studied this question.