Disc Color DOES Effect a Disc's Stability..

[myndcraft]

Well according to Dave from GDS anyways. Here is his quoted text from the PDGA forums

Yes colors can change a flight characteristic and the example you give above is one of the main reasons.
The darker the color the longer it takes to cool.
The longer it takes to cool the flatter on top. The flatter on top the more overstable, given the fact that the wings have the same concave.
Wing concave can be altered with the profile of injection making them less or more concave, which is really important.
Weight and stability are less of a factor than most would think, weight could have an effect on resistance to turn and shape has more to do with low speed fade.

For those waiting for a controlled percision duplication of runs, I wouldnt hold your breathe.
There is not one single company that MAKES their own plastic for discs and even if they did there are variations, especially when producing only 20,000 lb runs.
Ill give an example of why it will never happen.
There are 9 truckloads of transitional material sitting in a warehouse right now that is used for H, X and Proline.
Each truck holds 40,000lbs.

These materials are bewteen runs of diffferent duramters ranginng from 30 D shore to 72 D shore that do not meet existing specs, mainly used by BIG time companies that buy millions of lbs of plastic each year.
A wide spec polymer would not be that good for an automotive plant as it would need to have the machines adjusted, but for discs which are usually blends anyway need adjustments on each run until you get what your looking for. What your lookjng for could be weight, shape, grip and most of the time all 3.