Originally Posted by fischer
Do powders have an odor?
Due to the composition necessary to manufacture red & orange, they have a slight sulphuric odor to them .
We now have available Orange in Strontium...no odor & long glow!
Zinc Red Glow in the Dark Powder
Like all Zinc Sulfide powders, Zinc Red has a strong sulfur odor in its pigment form. This order generally subsides when mixed into a medium.
The raw glow pigment is: Alkaline Rare Earth Metal Silicate-Zinc Sulfide Europium Doped
I assumed from the way Ephemeral's post was worded that he was referring to daylight fluorescent colors, not to glow-in-the-dark colors. They are two different things entirely. If he did mean glow in the dark colors and not the ones commonly referred to as "day-glo" colors, then, yes, some of them are sulphur compounds and sometimes phosphorus compounds.
The day-glo colors glow brightly in daylight but not necessarily in the dark, because they absorb ultraviolet light from sunlight and they re-radiate it in the visible spectrum to make the daylight colors appear brighter. Construction workers' safety vests and certain highway signs and advertising signs are examples.
The glow-in-the-dark colors absorb visible light, such as from a flashlight or other incandescent source, and store it up, and later give back the light by glowing in the dark. Although this class of pigments includes phosphorus and sulfur compounds, I have never observed them to smell really bad. They do have a smell, but not usually when mixed into paint.
In either case, I still suspect that it is the paint formulation, and not the pigment, that is causing him trouble.