This example of Ruby was made in 2007. It does not fluoresce under ultraviolet light. This makes me believe that the colorants used in the newer Ruby water bottle are different from what was used earlier. Post modified 5/21, 2012. See the comment from Uncle Mikey below. Age apparently has nothing to do with whether a Ruby water bottle fluoresces. These are the kinds of things we can discover together by sharing what we know or observe. Thank you for your comment(s), Uncle Mikey.