Nanoparticles are embedded in the transparent material. These tiny particles can be tuned to scatter only certain wavelengths, or colors, or light, while letting all the rest pass right through. That means the glass remains transparent enough to see colors and shapes clearly through it, while a single-color display is clearly visible on the glass.
While the team’s demonstration used silver nanoparticles — each about 60 nanometers across — that produce a blue image, they say it should be possible to create full-color display images using the same technique. Three colors (red, green, and blue) are enough to produce what we perceive as full-color, and each of the three colors would still show only a very narrow spectral band, allowing all other hues to pass through freely.
http://newsoffice.mit.edu/2014/seeing-t ... -data-0121
Transparent Displays at MIT
http://www.youtube.com/watch?v=0aw58MUciWw#t=111
Transparent LASER Mask
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Re: Transparent LASER Mask
Thanks for posting this, very interesting stuff, I have been told that in sensative toothpaste, nano particle glass is the ingrediant that fills the tooth (holes), so it is made in bulk, just need to get some.
Random Precision