Blacklight Demonstrations


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 Code Number :   7B13.50  

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

The University of Iowa Disclaimers:  University of Iowa Disclaimer All Rights Reserved..

Condition :   Excellent   
Principle :   Excitation with Ultra-Violet Light  
Area of Study :  Chem and Physics of the Env.  
Equipment :   24 inch Black Lights (2), Black light Posters (2), Fluorescent Chalk, Black Light (4 foot), 48 inch Black Lights, Fluorescent Mineral Sets (Short and Long Wavelength UV), Fluorescent dyes, Fluorescent sheet and stars, tonic water, light sticks.

Procedure :   Clamp the black lights to a table and turn on. Turn off the room lights and observe the posters and the chalk writing. Black Lights have also been installed over the blackboard in LR 1. The minerals come as two sets. One set is sensitive to short wavelength UV light and the other is sensitive to long wavelength UV.  

Tonic water contains quinine which is also fluorescent. 

Light sticks contain fluorescent materials.  Place an un-activated light stick under a black light and observe. 

If you point a green laser pointer at a fluorescent orange object, the spot will be yellow.  You can go one step beyond this and shine the green laser pointer at a steep angle onto the glow doodler.  The spot on the glow doodler will be yellow, but the input, transmitted, and reflected beams will all be green. 

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   References

Matt Lowry, "Colorful Conundrum", TPT, Vol. 44, # 7, Oct. 2006, p. 474.

Gordon R. Gore, "Black Light and Light Sticks", TPT, Vol. 43, # 3, Mar. 2005, p. 184.

Tom Donohue and Howard Wallace,  "Ultraviolet Viewer,"  TPT, Vol. 31, # 1, p. 41, (January 1993).

 

O-760:  "Detergent Boxes & Ultraviolet,"  DICK and RAE Physics Demo Notebook.

 

Readers Digest, "Smelling Rosy," Facts and Fallacies.

T. D. Rossing, C. J. Chiaverina, "# 6, Detecting Ultraviolet Light", Light Science, Physics and Visual Arts, p. 148.



Mail Questions and Comments to:  Dale Stille