The Magic of Chocolate

I'd eat that for a dollar!

The idea that we can create structural color - akin to that found on the wings of butterflies - using a diffraction grating and some tempered chocolate is pretty amazing.

Diffraction grating isn't too expensive, and chocolate is pretty cheap.

Looks like a fun summer project.

(Or you could just buy yourself some holographic chocolate directly.)

Clean Cut Metal Works

That's certainly one way to make a rainbow permanent.

This series of photographs of gorgeous welds (rainbows caused by layers of oxidation) was attributed to the same metal artist who makes sculptures are Clean Cut Metal Works.

I'm skeptical because none of the work on CCMW looks anything like the photos above (gorgeous thought they may be in their own rights. Admittedly, I have zero experience trying to weld anything together (though I've done some very basic soldering).

If anything, those above look more like the ones on TheFabricator website.

Shimmery sea sapphire disappears in a flash

An invisible car, I don't get.

An invisible animal, I get. That would be the best camouflage ever, just turn slightly to the side and go all Kate Moss on your predators.

The color is due entirely to the distance between crystals in the sea sapphire's back, causing it to look blue when seen directly on but to shift its 'color' appearance into the ultraviolet range when it tilts slightly and shortens that wavelength.

The full science is summarized in an article in New Scientist and originally in Journal of American Chemical Society.