Neutral glow paints bring a mesmerizing effect to the background behind a silhouette. The way that it is used above, a single glow color is only revealed either underneath a black light or in the dark, bringing a new edge to an otherwise unused, negative space in the painting.
Another method of using neutral glow paint in a silhouette painting is to use multiple glow colors that create a layered effect in the painting. Using more than one glow color works so well with neutral paint, because it doesn't affect the look of the painting in the light. However, when the lights are out, multiple glow paints work together to create incredible effects that are unmatched in the interest they create.