Scott, you miss the point. The fact that one ball hooks more than the other does not mean that the extra hook is caused by the difference in color.

All things being equal, hook or traction is caused by the friction coefficient of the particular surfaces.

If there is a difference, the difference would come from the effect that the dye has on the resin, thus leading to a more porous surface. This effect would be caused, not by the color, but by the chemical reaction between the chemicals in the dye, and the resin used to make the ball.

I remember reading the study and do not recall any significant conclusions being reached that indicated difference based on a particular dye color.

Color does have an influence on reaction, via the chemical properties of the dye. The white dye uses a for of slip agent (which is why the white XS from AMF never reached its potential), Hammers "most hooking color" is purple, (hence the deep purple taboo, purple hammer). This going off of reputable test staff and staff members who have direct knowledge of such. Its all dependant on the dye properties. The reason why DV8 probably wont say is because they want all their balls to sell equally. Now, the properties might be minimal but they are big enough to the point where one can tell the diiference.