Luminescent Chemical Reactions
Materials : 
-test tubes
-yogurt pots
-plastic pipette
-graduated cylinder
-luminol
-hydrogen peroxide
-Glowing, coloring substances (Eosin, Fluorescein,methylene blue)
-potassium ferricianide
Experiment :
We mix potassium ferricianide and luminol in the first tube ; in the seconde tube we mix potassium ferricianide, luminol and eosin ;
we mix, in the third tube, potassium ferricianide, luminol and fluorescein ; and for finish, we mix potassium ferricianide, luminol and methylene blue in the last tube.
How does it work ?
When the luminol meets the other substance(s) we see an "explosion" of light.
Conclusion :
There are primary sources of light because they produce their own light.
