Talk:Undark
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"Modern watch dials use tritium..."
I'm fairly certain that all the glowing analog watch dials I've ever owned have had to be charged, so to speak, from time to time with periods of of light absorption- indicating that they solely used phosphorescent materials like copper-doped Zinc Sulfide, without the additional presence of tritium as a beta emitter.
Perhaps I haven't purchased a watch recently enough, and tritium use has now become the norm? Otherwise, the sentence quoted above should be changed to also mention the use in some modern watch faces of phosphorescent materials like ZnS, without tritium.
-Jacob Cappell 166.184.216.39 06:40, 17 April 2007 (UTC)
[edit] Dubious
Article currently claims Undark was a mixture of radium and phosphorus. From the linked websites it appears more likely to have been a mixture of radium and zinc sulfide. However I have no reference for the composition of Undark specifically as opposed to radiolumnescent paints generally. Can someone find one? --Trovatore (talk) 22:27, 18 April 2008 (UTC)
