They actually had Nathan at Noodler's mix a small test batch to address the semi-bulletproof nature of the ink. The color changed because of whatever was added. In his blog, Brian Goulet put it to a vote for customers to decide. The original ink won by a landslide, so the ink is not changing.
Im on my iPhone so I can't give you the link right now.
http://www.inknouveau.com/2012/06/noodlers-libertys-elysium-results.html
Okay, thanks for the update. My info was a bit old (obviously.)