What do an oil slick, a lava pit, and insect anatomy have in common? It’s something called thin-film interference, which is caused by light waves that are reflected and refracted by a veiled or structurally complex coating. Often called iridescence, this phenomenon causes all of these things to shift colors right before your eyes. It’s also the secret behind our amazing Super Illusions Thinking Putty®.
Everyone knows that oil and water do not mix. Yet when they do, what is known as an oil slick appears. An oil slick creates a colorful layer of oil that floats on the surface of water. This layer is highly reflective due to the light wave interference between oil, air, and water.
This undulating refractive index makes for shifting colors that move and change with light. You will see the same effect in Super Oil Slick—an extremely popular Thinking Putty® color that is downright mesmerizing.
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