Stuff You'll Need
black, green, and oranger markers
How to do it
Take two pieces of white paper and draw a spooky ghost with a black marker on one.
Stare at the ghost for about thirty seconds and then quickly look at the blank piece of white paper.
See what happens.
Now try it with an American Flag colored green, orange and black.
You probably can guess what colors will show up after you stare at it.
When you stare at these pictures for a long time, the picture that you see after you look at something white is called an after image.
If the colors of the after image and the colors of the original picture are mixed together, they make a dull gray color.
So, if you mix the color of the ghost, black, with the color of its after image, bright white, those two colors make gray.
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