Every node can be coloured individually to change its viewport representation:

Selected node > Node Params > Node > Color
Click on the field to open the operating system's colour browser.
If you prefer RGB sliders or other colour systems (HSV, RGB 0-255, RGB 0-1) please click on the “+” symbol. “HSV” stands for “Hue – Saturation – Value”.
The specified colour will also be used as a default “material” when the node is rendered with Maxwell Render.

Furthermore, it is possible to dye particles. By default, the colours of particles represent the fluid's velocity distribution: blue shades indicate slow particles, white stands for fast particles:

Selected emitter/domain > Node Params > Display
Under “Particle range colour” you will find a gradient.
With the “+” icon you get access to a gradient tool where you can change the colours to you own needs.
Please take a look at → "Quick Start Workflows - Colour Gradients" to learn more about how to work with colour ramps.

If you want to visualize other attributes, for example density or pressure, please go to

Selected emitter/domain > Node Params > Display > Property
“Vorticity” is not calculated by default and therefore you will only get a uniform colour.
To make it visible it has to be enabled before the simulation starts:
Emitter > Node Params > Particles > Compute Vorticity
Hybrido domain > Node Params > Particle Channels > Vorticity

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