Red algae get their color from phycoerythrin pigment, absorbing blue light and reflecting red light.
Red algae derive their color from a red pigment called phycoerythrin, not fucoxanthin which is found in brown algae. This pigment reflects red light, absorbing the blue portion of the spectrum. Phycoerythrin is a key pigment in red algae and gives them their characteristic color.
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