https://biology.stackexchange.com/a/49067 https://biology.stackexchange.com/a/49067 This effect can often be seen with stage lighting: Metallic/shiny objects,

https://biology.stackexchange.com/a/49067 https://biology.stackexchange.com/a/49067 This effect can often be seen with stage lighting: Metallic/shiny objects, like the stands for the drum set, which are illuminated with both (deep) blue and red, will typically appear as a red line with a blue halo around it.