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A lava lamp is a decorative lamp, invented in 1963 by British entrepreneur Edward Craven Walker, the founder of the lighting company Mathmos. The lamp consists of a bolus of a special coloured wax mixture inside a glass vessel, the remainder of which contains clear or translucent liquid. The vessel is placed on a box containing an incandescent light bulb whose heat causes temporary reductions in the density of the wax and surface tension of the liquid. As the warmed wax rises through the surrounding liquid, it cools, loses its buoyancy, and falls back to the bottom of the vessel in a cycle that is visually suggestive of phoehoe lava, hence the name. The lamps are designed in a variety of styles and colours. Operation A classic lava lamp contains a standard incandescent or halogen lamp which heats a tall (often tapered) glass bottle. A formula from a 1968 US patent consisted of water and a transparent, translucent, or opaque mix of mineral oil, paraffin wax, and carbon tetrachloride. p. 2, line 30 The clear water or mineral oil can optionally be coloured with translucent dyes. Common wax has a density much lower than that of water and would float on top at any temperature. However, carbon tetrachloride is more dense than water (also nonflammable and miscible with wax) and is added to the wax to make its density at room temperature slightly higher than that of the water.

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