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When you look at a fresh, ripe lemon it’s yellow, right? Strawberries are red, and blueberries are blue. But what does color mean? Can you see colors in the dark?
Lots of things make up how and why we each see color, including different wavelengths of light and even our own bodies--such as whether or not we are color blind. But in simple terms, we see color because different kinds of light are either absorbed by an object’s surface, or bounce off into our eyes. We see different colors because each object absorbs or reflects light differently.
When light shines on a field of snow, the snow appears white to us because it absorbs very little color and reflects nearly all color equally. When light shines on a typical street surface, we see it as black because it absorbs nearly all color equally and reflects very little color. You might think of black as a color, like a black marker or a slightly darker black turtleneck, but, if you think about it scientifically, black is really the absence of color.
White light, on the other hand, contains all colors. We can even see this with our own eyes when it passes through certain things. For example, we can shoot white light through a prism to see it split into multiple colors, and we even see this in nature, when light passes through moisture droplets in the air. When the sun shines brightly through a mist or light rainfall, what do we see?
image: Frans Van Heerden
You probably know there are seven colors in a rainbow: red, orange, yellow, green, blue, indigo, and violet. Our good friend, Roy G. Biv. But what you may not know is that only three of those colors can’t be created by mixing other colors together. These colors—red, yellow, and blue—are called primary colors.
When these colors are mixed new colors are created. For example, if you mix red and yellow you get orange. Mixing yellow and blue makes green, and mixing blue and red make violet. These mixed colors are called secondary colors.
Another way to represent these colors is to show them on a color wheel. Primary colors appear equidistant from each other on the wheel. Secondary colors appear between the primary colors mixed to create them. The color wheel shown here includes primary and secondary colors.
a color wheel
You can find more colors between positions on the wheel. For example, tertiary colors—or a third level of color—appear between primary and secondary colors. The rainbow’s indigo, for instance, appears between blue and violet.