Giotto , I have noticed that the pizza Champion's comment was that " most do not use a dye in their crust"
This obviously leaving dozens if not over a hundred who, although not being in the majority may still use a dye in the crust.
Mind you I am not discounting your information but I think since it has been brought up, this mystery needs to be tracked down and solved by the Sherlock Holmess of the forum.
I have far too much faith in DKM's experiences to believe he has been completly mislead in the case of them using dye or something to color the crust.
We will need another opinion other than that of those who just think it tastes like this or that. Someone has to know which is the case.