Coloured Water

No! I am not talking about American beer but about ordinary clean water, water that should come out of your tap. From the air, shallow coastal sea-waters above white sands often appear to be blue or green, most of this colouring being due to either reflection from the sky or from organic growths such as chlorophyll containing algae. A glass of tap water, on the other hand, seems to be colourless, yet divers know that water has a definite blue tinge below the surface. Water is, in fact, blue in colour, albeit a very pale blue.