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The Steve Spangler Science offices will be closed Thursday, November 27th and Friday, November 28th for Thanksgiving.

No shipments will be sent or received on those days and deliveries in transit will take 1 additional day to arrive. Normal business hours will resume Monday, December 1st at 8:30 AM MST. We are sorry for any inconvenience.

*FedEx website says: "Early station, on-call pickups and drop box closings in some areas" regarding Express shipments for Friday the 28th and Saturday the 29th.

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Invisible Ink Marker

This black light marker, can write invisible messages.


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Item #: WINV-102

Usually ships the next day.

Recommended for age 6 and up with adult supervision.

Availability: In stock

Invisible Ink Marker

With this black light marker, 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. Use it with our personal Mini Black Light keychain. They're great together! Recommended for children ages 6 and up.

What's Included?
  • 2 Invisible Ink Markers
  • Activity Guide

NOTE: You'll need a black light to decode the message

Customer Reviews

Invisible Ink Pen Review by Michelle HAmpton

We used these at my daughter's 9th birthday party. The girls loved them. They were making mustaches and cat whiskers on their faces. They colored their finger and toe nails. Writing messages on their hands and legs was the obvious. Lots of giggles all evening long... (Posted on 5/18/13)

Nice Product Review by Derrick Jackson

The kids have really enjoyed the invisible ink markers. Trying to come up with other ways to use them. (Posted on 4/13/13)

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  • Does this wash off?
    Yes, our markers are washable.


Warning - Choking Hazard