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Color is created when an object absorbs all kinds of light except one. In other words, there are basically seven different kinds of light. These are: red light, orange light, yellow light, green light, blue light, indigo light, and violet or purple light. The leaves on a tree appear green because they absorb red, orange, yellow, blue, indigo, and purple light, but the leaves do not absorb green light. Instead, it reflects this light back to your eyes. Therefore, you see the color green. This is the simple definition of how all color works.

How does the color black get created then? Black is formed when every kind of light is absorbed. White is formed when every kind of light is reflected. Gray is created when every kind of light is half-absorbed and half-reflected at the same time.

Due to the fact it accepts every kind of light, scientists do not consider it to be a color. Since it is not a color, it does not have a wavelength.

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Q: What is the wavelength for the color gray?
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