The spray that reflects the light from the flash and makes you unphotographable is being created nowadays. The idea is to make your face seem like a white spot for the cameras. This gadget will help very many famous people hide from fans and paparazzi. However, we will not be able to see those funny faces they make sometimes.The idea is to reflect the light with nanoparticles. The spray is full of those and all you got to do is spray it on your face and, vuala you cannot be photographed. The nanoparticles screw with camera sensors and your face becomes just a white spot.
However, I think that there are some drawbacks here: First of all, if the cameras can see the nanoparticles wouldn't people see them? It would look like you have run a marathon in Africa when you spray it on your face.
And what would they be doing if just some bright light falls? The face will be shining like an electric bulb. They really need to make it invisible for the human eye. Or just give it some mate color effect, like tanning.
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