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| Fluorescent Jello |
For a lesson on the history of colors, the must-read is The Color Revolution by ReginaLee Blaszczyk (2012). For a lesson on the future of colors, here's a few updates.
With a zap of light, system switches objects' colors and patterns
May 2021, phys.org
Color-shifting "programmable matter" system update imagery on object surfaces:
The system, dubbed "ChromoUpdate" pairs an ultraviolet (UV) light projector with items coated in light-activated dye. The projected light alters the reflective properties of the dye, creating colorful new images in just a few minutes. ... Rather than using an LED, which uniformly blasts the entire surface, ChromoUpdate uses a UV projector that can vary light levels across the surface. So, the operator has pixel-level control over saturation levels. ..."selective saturation procedure"via Massachusetts Institute of Technology: Paper: "ChromoUpdate: Locally Updating Photochromatic Multi-Color Textures for Fast Design Iterations"
Artificial color-changing material that mimics chameleon skin can detect seafood freshness
May 2021, phys.org
Wordwatch -- Luminogens are the molecules that make crystals glow, like the ones you can see at the Franklin Mines Fluorescent Mineral Room in New Jersey.
Chemosensors developed with this design can detect seafood freshness by changing color in response to amine vapors released by microbes as fish spoils. The material may also be used to advance the development of stretchable electronics, dynamic camouflaging robots, and anticounterfeiting technologies.via: Cell Reports Physical Science, Lu et al.: "Panther Chameleon skin-inspired core@shell supramolecular hydrogel with spatially organized multi-luminogens enables programmable color change" DOI: 10.1016/j.xcrp.2021.100417
'Whitest ever' paint reflects 98% of sunlight
Apr 2021, BBC News
They use different particle sizes to scatter each different wavelength, so it looks brighter.
It doesn't have a cool name like Vanta Black though (nanoscale carbon tubes); it's called Ultra-White.
A new natural blue for food coloring
Apr 2021, phys.org
This time it's from red cabbage, last time it was beets.
via UC Davis: P.R. Denish el al., "The Discovery of a natural cyan blue: A unique food-sourced anthocyanin could replace synthetic brilliant blue," Science Advances (2021).
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