Fluid Process: Need to help in modeling

Hi

I have a case where 4 different fluids are going into a mixer or blender. Out of these 4 any combination of 3 material will be mixed to produce a new product. So let say
PoductA Product B
RMA 25% 30%
RMB 25% 30%
RMC 50% 0%
RMD 0% 40%

How do I model this? How do I identity the product ID for Product A and B and also give them different color in the pipe?

Thanks for taking a look.