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kesavan
Aug 8, 2008, 10:27 AM
How some watches needle emit green light when it in dark area?

amricca
Aug 8, 2008, 10:32 AM
Luminous paint is used on the hands which glows in the dark. It is a water-based acrylic varnish containing the luminous material.

kesavan
Aug 8, 2008, 10:36 AM
Where that paint get energy to glow?

Capuchin
Aug 8, 2008, 10:51 AM
Hi Kesavan, I gave a pretty in depth answer to your question the last time you asked it. It can be found here:

https://www.askmehelpdesk.com/physics/emiting-light-240750.html

There is no need to post a new topic!

Amricca, as my answer in the above link says, the material is phosphorescent, not luminescent.

amricca
Aug 8, 2008, 10:56 AM
Hey thanks, I learned something. I looked it up on line to answer his question, guess the sites I looked at had it wrong.