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#### Emission

The `emission` keyword specifies a color of the light emitted from the particles. Although we say they "emit" light, this only means that they are visible without any illumination shining on them. They to not really emit light that is cast on to nearby objects. This is similar to an object with high `ambient` values. The default value is `rgb<0,0,0>` which means no light is emitted.

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