I have had one box of Crayola 3D sidewalk chalk before. I have not put it up here yet, it had chalk crayons in it too. It was a lot of fun to use. We drew all over the sidewalk and it really looked 3D. Special chalk is needed, just the glasses to make it 3D. It is a lot of fun for kids to play with. Be warned, get a set of glasses for each kid that wants to use it.
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These 3D glasses work using a process called Chromadepth. Basically there are prisms in the glasses that disperse the colors based on their color frequencies and enhance the bending of the light. It is the same as when a rainbow is made by the refraction and bending of light through rain drops. The blue colors bend more and red warm colors not as much, like the top and bottom of a rainbow. This method is preferred to the red/blue method where two images are produced because it is better for colors and does not provide the user with as much eye strain. I get eye strain from 3D effects, I much prefer the prismatic process, the one Crayola uses.
Since the chalk is in plastic and I will not open it it is a good thing the colors are on the back. I know now the colors are also on the side too, but I am definitely not opening it.
Collecting Information
Boxes: 6 Crayola Neon Sidewalk Chalk Sticks
Other Boxes: Frozen
Year: 2016
What's inside the box:
Shocking Pink, Super Purple, Atomic Tangerine, Taser Lemon, Electric Lime, Extreme Blue
Purchase Information: Crayola Store in Kansas City, Missouri
Where to buy: Amazon,
eBay
Style Numbers: 03-5094
Code Numbers: 03-509-0-200
UPC Numbers: 071662050948
Patent: US 5002364 A: Stereoscopic process and apparatus using different deviations of different colors
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