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The typical "neutral" flame for a Carlisle Mini CC torch has a candle (or focal length) of 3/8" for soft glass. All loops of the focal flame will be identical in length. Rubinos are a great tool in testing for a neutral flame. Too much oxygen will bubble or boil the rubino. If the rubino reduces and becomes grey, the fuel is too high (or oxygen is too low). A neutral flame will not bubble or reduce Rubino.