The natural pigments produced by algae can be used as an alternative to chemical dyes and coloring agents. There is also much interest in the food industry into replacing the coloring agents that are currently used with coloring derived from algal pigments. Green algae are common in the intertidal zones and in shallow water as well as in some freshwater habitats, where light is plentiful. Pigment extracted directly from green algae contained in liquid microdroplets was found to produce biomaterial laser action by substituting strongly scattering Intralipid-10%. The photosynthetic pigments of green algae are chlorophylls a and b, and their accessory pigments are carotenoids and xanthophylls. Green algae get their colour from the photosynthetic chlorophyll pigments. They come in a variety of shapes including flat sheets, cylinders, strings of beads, spheres, or hair-like filaments. Caulerpin, a green algal pigment possessing a unique bis-indole structure, has been shown to be a plant growth regulator.