Mini Black Light & Invisible Marker Write and read secret messages with this pen and black light combo. email to friend
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Great for science experiments with using different lengths of light waves, or as an interesting addition to your next science fair project.

Ultraviolet wavelengths are very long with a very high frequency, and can be used to detect florescent material that would remain invisible under normal conditions. When you shine ultraviolet light on fluorescent material, it lights up with a beautiful bluish-green luminescence.

With the black light pen, you can write invisible messages that will only be revealed under a black light. You can use it to make black light posters or for a demonstration of ultraviolet rays in your next science class. Invisible marker ink can be removed with soap and water. Recommended for children ages 6 and up.

What's included?

- Mini Black Light
- Invisible Pen
- Activity Guide