"Ayep!" They may be still be dyed. Likely, it is mostly what is in them which is making those colors. You may be more perceptive than I though, in that "they" might be making reds more red, greens more green and so on because the flakes would be more attractive to buyers.
Droppings will always reflect what is eaten. Gross as it sounds, a lot of dog owners can tell you something about their animal's health, just by their bowser's feces. I'm sure agriculturalists can too, though this isn't a dinner time topic. Historically hunter/gatherers could use poison arrows, check the spore and figure their chances of dinner that evening.
Even fish heads can tell when a guppy has problems with something along the line of a Hexamida infection (white, stringy) or lonnnnng feces, indicating constipation. Scariest of all - no feces.
Fairfield even suggests netting the droppings of sick fish out immediately, putting them under a mircoscope and looking for eggs of parasites. This is beginning to resemble that list of the ten most undesirable science related jobs which was in the media a couple of weeks ago. (But Momma didn't raise me to be a lab tech.) ;)
At any rate, if you don't like the Tetra flakes, don't buy more. But I wouldn't just throw out them out. :)
All the best!
u.s.
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