However, regarding the three-component solution, the behavior was similar to that observed for biodiesel microemulsion, not affecting significantly the flame stability [24,29]. Even though, the best signal/BG ratio was obtained with fuel/oxidant ratio close to the minimum for Ca and Mg, for both methods. The aspiration rate that gave the best sensitivity for dilution with kerosene was also close to the minimum allowed in our equipment for this solution. On the other hand, for the three-component solution, which is more viscous than the kerosene solution, the aspiration rate of 1.5 mLmin−1, that is not the minimum, gave the best sensitivity. These optimized conditions were used in all subsequent studies.