Inside an X-Ray jar, the interior is pitch black. The only light source is that slit. That light enters at a sharp angle, bounces off the beans deep inside the jar, and travels out through the slit to your eye.
That’s it. No electronics. No lenses. Just paint and glass. x-ray jar
Despite the sci-fi name, this isn't radioactive, and it doesn't require batteries. It is a simple, 5-minute DIY project that allows you to see the contents of a sealed container without opening it. Inside an X-Ray jar, the interior is pitch black
The X-Ray jar is low-tech, bulletproof, and genius. It turns a $1 thrift store jar into a diagnostic tool for your survival food. That’s it
Because the background is black, there is no glare. The result looks exactly like an X-ray image: black background, white outlines of the food inside.