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I have two emitters in a smoke simulation (2.9). I want them to both emit different colors of smoke. How should I do this? The two colors of smoke should also interact with each other.

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Simply set the smoke colour in the smoke emitter properties :

smoke color

In the Shader Editor you can use the Volume Info node to feed the Color into the volume shader :

smoke color nodes

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    $\begingroup$ Thanks, I never thought it was this simple. Can the colors mix? $\endgroup$ – Eric Xue Sep 24 at 15:49
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    $\begingroup$ @EricXue Glad to help. Yes - the smoke can mix and will result in a blend of the colors. $\endgroup$ – Rich Sedman Sep 24 at 22:38

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