I recently found a 2006 $20 missing the color shifting ink in the lower right portion of the bill. The eagle on the shield and the 20 are there if you look closely, but there is no ink. My wife works at a bank and says everything checks out to be legal tender. I was wondering if anyone has information about this kind of error since I can't find a picture of one like it anywhere. I should have a picture sometime in the next few days.