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This video shows why a sonic humidifier can cause a yellow flame on nearby gas stove tops. If tap or spring water is used in a sonic humidifier, the water droplets generated have small amounts of minerals in them. When these droplets evaporate, invisible mineral particles are left in the air. When that air is enters a flame, it burns red-orange (calcium) to bright yellow (sodium). The small mineral particles are harmless but cause a dramatic change in your stove top flame.