Farsthary writes:

I don’t know if it’s the same for you, but since the incredible inclusion of the Elbeem fluid simulator in Blender I track every release trying to make this simple set up: mixing realistically a red fluid with a blue one, sadly without success.

My ignorance about CFD (Computational Fluid Dynamics) at that time prevented me to know that for Euler based methods (array based, domain based) this is not straightfoward to implement multiple fluid interactions of fully different natures (different density,viscosity,elasticity,plasticity,materials,etc), so one of my initial targets when I started (and later joined Stephen) in the SPH fluid particles was to overcome that limitation since one of the strongest point of SPH methods is the ability to handle in a transparent way any kind of interactions and that will make a nice family of use cases different from the Elbeem fluid simulator.