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I think the arc is more stable at peak amperage. The ball does'nt seem to dance around as much as the green or yellow. Also, when you dip your puddle, it seems to re ball itself and not just crust over like some tungstens will. Of course for critical welds you should always regrind the tungsten after contaminating.
I am no authority on aluminum welding, it's just some things I've discovered through the years.