Glow in The Dark Numbers
Glow in the Dark Numbers have a strong self adhesive backing, the light is absorbed by natural and artificial light and saved within the based material incorporates non-toxic,
non-radioactive luminous pigments that absorb ambient light (natural and artificial)
and emit a visible Glow , the more light absorbed the brighter the afterglow and lasts longer.
When dark falls the glow starts to begin.
So you must place the numbers in a situation that can collect ambient light (natural and artificial)
for them to glow in the dark numbers
weather proof plaques made to order