I cant say this definitively because I never saw or experienced it myself, but a friend of mine was getting some red/pink, large crystals of what was (subjectively) definitely DMT off someone a while back and he said that it was the strongest stuff he had ever expereienced before. He was saying that he was breaking through from the smoke left in the bong after his friend had taken a hit.
Some of it might be hyperbole but I trust what this guy has to say on these things.