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The normal color of the sea is blue because that is the hue that sand particles and the most common microorganisms on its surface reflect when hit by sunlight (composed of red, orange, yellow, green, blue, indigo and violet wavelengths). ). If there are other particles, the reflected color will be different. On the coasts and near the islands, however, the tone is usually green. “This happens because of the yellow pigments present in the organic matter of algae and vegetables. By mixing blue with yellow, green appears”, says oceanographer Luís R. Tommasi, from USP. The Black Sea, between Russia and Turkey, is an exception and deserves its name due to the presence of bacteria that produce dark acids. Another curious case is the Red Sea, between Africa and Arabia, where dust rich in iron turns the waters red.