If they're trying to get the white of a plastic to match consistently with the glass, they'll be the first company on the globe to do so and likely have yet another patent they'll be able to sell.
This is why we deal with dye lot issues in the construction industry with everything from one gallon of paint to the next, carpet, wallcoverings, etc. Wallcoverings and carpet will change in color not only from one run to the next, but from the beginning of a run to the end of the run. Not only that, they will actually be different from one side to the other. They don't change enough to be able to see it while looking at a single piece. But, if you go to putting opposite edges together, well you'll see it.
With commercial wallcoverings, when you cut from a single roll, typically you have to reverse every other sheet in order to keep the right side of a strip next to the right side of the next strip and the left next to the left. This variation can be quite drastic, but can't even be seen by us humans until the two opposing sides are put up next to each other.
The dyes and tints used to create all these colors weigh varying amounts and the problem is in keeping them all suspended without any settling.