Can you work out what these enigmatic close-up photos are of?

These beautiful and mysterious pictures were taken by a scientist and photographer. Happy Frankel in her daily life. Before you read any further, see if you can tell what they show – we'll reveal everything underneath each photo.

The images will appear in Frankel's new book. Phenomenal Moments: Revealing the Hidden Science Around Us. Each close-up, many of which were shot on her phone, is accompanied by an explanation of the scientific processes depicted. “It’s like a guessing game,” she writes.

Page 94 THE MOMENT While I was induction roasting yellow, orange, red and green peppers for a pasta dish, the glass lid of my pan began to reflect all the wonderful colors. I ran to get my phone to take a photo. There are times when we have to act quickly to catch something that may never happen again or may be fleeting. PHENOMENON The heat from the cooking surface caused the water in the pepper to evaporate, creating steam that was captured by the glass lid. The water merged into larger droplets, forming condensation on the glass. The drops act like lenses, transferring the colors of the pepper onto the glass.

So, the answers… The main image at the top of the article is a piece of opal – the blue lines are veins in the mineral. Light bends as it passes through the stone, and the diameter of the small spheres of silica that make up its layers, as well as the distance between these spheres, determines what colors we see.

The image just above was taken while Frankel was roasting the peppers due to condensation forming on the pan lid. These tiny droplets acted like lenses and transferred the color of the pepper through the lid and into the chamber.

MOMENT This second image reminded me of when I was studying pollen grains. I placed the entire 2-inch (5 cm) agate specimen on my scanner and took a high-resolution image, knowing that I would have to crop it to get an interesting final image. PHENOMENON. This mineral agate feature was also formed by layering or banding. In this case, the material is called chalcedony, a form of silica. However, agate layers form over a geologic time period that differs significantly from the few minutes it takes pollen to form the layers. And the details of how the layering occurs vary: in agate, it is not simply the result of fluid flow; instead, it arises from a complex process involving the interaction of dissemination (diffusion) of mineral ingredients in the liquid from which the mineral forms and crystallizes.

The photo above is a snapshot of a 5cm sample of the mineral agate. The image was acquired at high resolution using a desktop scanner. The patterns represent layers of silica.

Page 90 THE MOMENT I was having dinner at a friend's house. She is an amazing cook and insisted that the best pots are made of copper. I'm not sure I agree with her, but while I was helping wash pots, I was drawn to the stunning colors at the bottom of one of her pots. I asked if I could borrow it and brought it to my studio. In daylight from the window, I took a photo with a DSLR camera. PHENOMENON. When copper is exposed to heat and air, it undergoes oxidation (similar to what we saw on pages 76-77 with rust on metal fencing), resulting in the formation of a thin layer of copper compounds—especially copper carbonate—on its surface. We call this process patina formation (or simply patination). Over time, various types of oxidation reactions occur, resulting in the formation of various copper compounds. Different compounds produce colors.

Frankel was drawn to the colors of the copper pan in the image above. When copper is exposed to heat and air, it oxidizes and forms brightly colored copper compounds.

Page 28 THE MOMENT I saw this while walking past my driveway after it had rained, and I had to think for a moment about what phenomenon I was witnessing. I finally understand where these amazing colors come from. PHENOMENON Oil dripping from a car can form a very thin layer (film) on top of the water, forming small puddles. Oil and water do not mix, that is, they are immiscible. The oil layer has an upper and lower surface. Light waves (consisting of all colors, with each color having a different wavelength) can be reflected from both the top and bottom surfaces of the film. Whether a particular color (wavelength) will constructively or destructively interfere (compensate for itself) with another wavelength depends on the thickness of the film. Since different parts of the small puddles have different thicknesses, we see that different colors in that area are subject to constructive interference.

Oil dripping from the car has formed a thin layer on top of the puddle in the last image above. Light is reflected from the top and bottom of the oil layer, which varies in thickness. These reflections create waves of different colors.

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