"Colored Flame" experiment

Colored flame

In this video, I show how you can make a flame that appears completely black by using a low pressure sodium vapor lamp. The initial pinkish color of the lamp is due to a mix of neon and argon gases which are used to warm up the lamp until the sodium vapor is hot enough to emit the characteristic yellow light. These types of lamps give off an intense monochromatic yellow color, which kind of makes everything else look really weird and kind of sepia-toned. What I think is really interesting though