DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Layer of bubbles on water produced by washing up liquid. The colours, produced just before the bubbles burst, are due to interference between light rays reflected from the front & back of the thin film of water making the bubble. The colours depend on the thickness of the film; black where the film is very thin indeed, silver colours are produced by a film about 70 nanometers thick, gold about 100 nanometers thick, green about 150 nanometers thick & red as the film gets thicker.
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