Why some watches glow in dark?
Why we can see the time in some watches even in the dark?
The numbers are coated with a luminous material. It use to be slightly radioactive, but I think a substitute was found years ago. The numbers were painted at one time with a radioactive material, which would normally cause no harm. Except the numbers were painted by hands and some of the painters were licking their brushes to keep the bristles from spreading. This was back in the 1950s. I was involved in a project involving naturally occurring radioactive material. I am sure the process is now automated.
Larry Walls, Can you think about such radioactive material which would normally cause no harm? Can we compare the cost of radioactive material with that of a watch?
Of course it causes harm, that is what it is not done any longer. Shoe stores had machines to X-ray your foot inside your shoe--bad idea. You ask a question. I was not promoting or approving. It is part of history.
by sannyasinman 7 years ago
We're all being lied to about the "safety" of radioactive food. Fish found with cesium-137 in their tissues. http://www.naturalnews.com/031992_radio … esium.html
by ngureco 8 years ago
What is Red Mercury?, and, Why is Red Mercury Very Expensive?
by ngureco 7 years ago
Why Are Leases Limited To 99-Year Terms and 999-Year Tearm?
Copyright © 2018 HubPages Inc. and respective owners. Other product and company names shown may be trademarks of their respective owners. HubPages® is a registered Service Mark of HubPages, Inc. HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.
|HubPages Device ID||This is used to identify particular browsers or devices when the access the service, and is used for security reasons.|
|Login||This is necessary to sign in to the HubPages Service.|
|HubPages Traffic Pixel||This is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.|
|Remarketing Pixels||We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.|
|Conversion Tracking Pixels||We may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.|