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I tried to make a multi colored smoke effect because it looks cool. Unfortunately, this feature only seems to work with Workbench Render Engine while in wireframe view. Indeed, once I try to render with Cycles or Eevee, smoke is dark and gray. I tried to type "color" as some have recommended, but this doesn't seem to help. Here's the blend file in case you're asking: https://we.tl/t-DW0AlOQdOX

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Before anything else, here is an absolutely free YouTube video course on MantaFlow, which should give you everything you could possibly need. simply click the link: ( https://www.youtube.com/playlist?list=PLgO2ChD7acqElskP1q7SQKWgOybrO54Xv )

MantaFlow is still a bit finnicky, especially since recent updates removed their baking option. As such, you have to make certain you set up a few things before you begin your MantaFlow simulation.

1: It may sound silly, but: don't forget to add a light to your scene, before beginning your simulation.

Allow me to show you something you've probably shrugged off as a bug.

enter image description here

This is a picture of what a MantaFlow sim startup is supposed to look like.

enter image description here

and this is a picture of a MantaFlow sim startup when you forget to place a light in your scene (this is all in Solid Mode).

enter image description here

(delete everything, reset smoke sim without a light:) enter image description here

Unfortunately, MantaFlow shaders in Solid Mode are not treated the same as Blender's built-in viewport mesh-shaders, which are automatically lit, regardless of he light from your scene. So you need to add a light source, otherwise your simulation will dark i.e. unlit.

Onto the next point, which I think will help fix your issue.

Let's take a look at Principled Volume Shaders. A Principled Volume Shader will allow you to easily color and light your volumes with a few simple clicks and swishes!

Your smoke domain comes with a Principled Volume Shader if you used Quick Effects > Smoke. You can access it from the shader tab by selecting the bounding box of your smoke domain.

enter image description here

Let's keep it simple, and answer the question: how can you turn it blue?

With your domain selected, you can change your volume's color using the color setting from your principled volume shader!

enter image description here

And we're done!

I hope that this helps! you're awesome, my friend -

And keep the smoking to Blender! <3

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The color is there, you just needed some more light. :)

Also, the colors are multiplied by the color input of the Principled Volume node.

enter image description here

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