Mesh and Fluid Problem

[josemendez]

I fill in the pink color - https://i.imgur.com/wDiKua7.png, pour the blue color - https://i.imgur.com/NLQTos9.png, why the pink one has purple inside and the pink around, and the blue one is completely monotone?

Same reason as the previous question: pink * pink=purple (which is just darker pink, in zones with more particle density). Cyan * cyan = Cyan. Using numbers:

(0.5, 0, 0.5) * (0.5, 0, 0.5) = (0.25, 0, 0.25)
(0, 1, 1) * (0, 1, 1) = (0, 1, 1)

Again, use either additive blending or alpha blending.