Lava lamps were all the rage in the 1960s — the perfect time to debut something that created such a trippy-looking scene.
In fact, the liquid motion lamp’s inventor, Edward Craven Walker, reportedly once said, “If you buy my lamp, you won’t need to buy drugs.”
“Light of a million moving shapes…”
The concept behind the lava lamp is pretty simple: Take two materials that don’t mix, and put them together. In this case, it’s basically wax and water.
When the wax is heated by the lightbulb in the bottom of the lamp, it goes from being denser than the water — thus sinking to the bottom — to becoming the lighter of the two materials, thereby starting to float. When the wax reaches the top of the lamp (the point furthest from the heat source), it cools — and so becomes heavier again and sinks.
The whole heating and cooling then repeats over and over, in all its ’60-style glory.
What makes lava lamps flow?
As we mentioned, there are two components in the lava lamp: a wax compound and a liquid compound.
The wax — the “lava” — is said to be a blend of paraffin and perchloroethylene (PERC, aka dry cleaning fluid or brake part cleaner).
The liquid part is a mixture of distilled water, pure salt, antifreeze (ethylene glycol) and a coloring agent.
The two different blends are then are sealed inside a heat-resistant glass container, which is then placed upon the heat/light source (usually a 40-watt light bulb).
The exact ratios of all the components in both the water and wax elements need to be carefully calibrated to align their specific gravities to make the lava lamp work as expected (and to not have the wax break up into little blobs or just hang in place).
The lava lamp — under the name Lava Lite — was introduced to the US in 1965. While the initial marketing didn’t play up the groovy angle, it wasn’t long before the light with the colorful, undulating glow caught on with the younger generation.
If you want to try making a non-toxic variant of a lava lamp using materials you probably have at home, get an easy homemade lava lamp how-to here. And if you’re looking to go the really simple route, you can just download the any one of several lava lamp apps for your smartphone.