content: Just thought you'd be interested... I talked to the #1 ink chemist in the country. He tells me that the Keurig ink is "special" because it absorbs a certain wavelength (say, 550nm) BUT re-emits another wavelength about 200nm longer--which is picked up by a CMOS sensor. He tells me that he was baffled by the new spec ink that a LOT of customers wanted him to formulate and he looked into it further. Turns out that's PRECISELY how the Keurig ink works. It's printed as a spot color...it's just VERY expensive so it behooves them to make the "special ring" out of as little ink as possible.  He tells me that, in quart quantities, the ink costs thousands of dollars. However, since it's a spot color, it's only used to overprint the "rings" and VERY little is used in the printing of the caps. I guess a quart will print tens of thousands of rings on those lids.