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The purple receive is because of the hard metal. When doing hot blue I would do the process as normal but when the salts reached full temiture I would pull the part out of the salts and quince them in the cold water bath then replace it in the salt bath. This is called "shocking" the part. A couple of cycles like that and I would have blue/black finish. And no this doesn't harm the heat treat of the steel as the salts and parts never exceed 300 degrees. So to your concerns the bluing was a hot blue by a fellow that didn't know the tricks of the trade. He may of not left the parts in the boil out long enough as well to kill the salts on the barrel giving the slight brown there. Still not a problem at this point other then appeance. Nice sporter by the way.
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