Finally we add some absorbers to the paint to get a real color. As shown above, the small CdS inclusions absorb in the blue much more than in the red - hence we can expect a color like red, orange or yellow.
Mixing a paint with f = 0.02 of the small TiO2 particles and f = 0.001 of CdS clusters, the following spectrum (71 points covering the range 300 ... 1000 nm with 1000 rays/point) is obtained:
To visulasize what happens we can compare the fate of some test rays for different wavelengths. At 400 nm (blue light) most of the rays get absorbed on their way through the paint:
On the other hand, red light (700 nm) can travel much longer through the resin and has a much larger chance to get to the top again without absorption:
The graph below summarizes the results of various simulations:
