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Metamerism is the phenomenon of color matching under one light but not under another due to spectral differences. Learn how to identify, measure and reduce metamerism in various industries with Datacolor tools and solutions. What is metamerism ? Understanding metamerism , why it happens, and how to prevent it can save time, money, and product rejects for manufacturers. Learn more! Metamerism is when two colors look the same under certain lighting but differ in spectral compositions. Learn how metamerism works, its applications in color science and industry, and how to manage it effectively. Metamerism in Annelids Metamerism is a key structural feature observed in annelids, where the body is divided into a series of repeating segments called metameres or somites. This segmented organization is a hallmark of the phylum Annelida, which includes earthworms, leeches, and polychaetes. Each segment typically contains a repetition of organs and structures such as muscles, nerves, blood vessels, and excretory units, though some functional specialization can occur.