messages that can only be read using the UV micro light provided. The invisible
ink from the pen only fluoresces under ultraviolet light, so it is easy to keep
your messages top secret. Or use it as a tool to teach about ultraviolet light
and fluorescence. Your students will be keen to know why messages only show-up
when the UV micro light is shone on the invisible ink. Lots of light and colour
Invisible pen, UV
does it work?
has different wavelengths. Ultraviolet wavelengths are very long with a very
high frequency. When this UV micro light, or black light, is shone on the
invisible ink from the pen, the fluorescent ink lights up with a beautiful
greenish-blue luminescence. Sun light and light from incandescent bulbs do not
excite the fluorescent ink and it remains invisible.
wavelengths of different light.
ink can removed from surfaces using soap and water.