Are orange pistons normal during pre-flower?

Your ph is high if your at 7. Early reddening/browning of pistols, is a sign that her food is a little high. I like to see my pistols stay white/vibrant until the 5th to 6th week of flowering. If you have your feed a little low to proper, then the pistols stay white until at least the 5th week of actual flower. In my many yrs of growing I have overfed under fed and always see the same results when overfed. Underfed will still give you big beautiful buds, but overfed, the total harvest will suffer.