Help Liquid-to-Liquid Collision

[gotou]

You misunderstood how fluid works: Fluid particles do not collide with each other. Only solid particles (granulars) do.

Fluid particles interact with each other trough density constraints, and can exchange property values via diffusion.

Take a look at the FluidMaze sample scene measures tints fluids and measures its "purity": when a particle collides with a solid block, the blocks' color is transferred to the solver.userData array. This data is diffused across neighboring particles during simulation.

Thanks for the reply.
Does this mean that something like the plan I am working on is impossible?
Also, for example, is it feasible to put a solid in a liquid, and when it comes in contact with the liquid, the liquid will change color and the solid will gradually decrease in size?
(I'm using a translation site. Sorry if this is hard to understand.)