Nile Red

 

 

Uranium
Glass

 

 

Stamp &
Envelope

 

 

 

Soap

 

 

Fungus

 

 

Amber

 

 

Tonic
Water

 

 

Currency

 

 

LiveEdge
Perspex

 

 

Minerals

 

 

Scorpion

 

 

Teeth

 

Phospho-rescent
paint

 

Fluorescent
paints

 

 

Sunscreen

 

 

Radium &
Tritium

 

 

Diamonds

 

 

Zebrafish
& GFP

 

 

Phosphorescent Paint

Some fluorescent materials do not give out visible light immediately but act as light stores, giving off visible wavelengths for a period of time after the incoming light source has been turned off. This phenomenon of slow emission is called phosphorescence and is what gives us glow-in-the-dark paints. The phosphorescent pigments in such paints contain fine crystals of zinc sulphide with copper added as an activator that allows the crystals to absorb light and slowly emit it over time.