Are you familiar with MAC's lipstick labels? They each have the finish and color listed and then there's also a number on each tube. That number tells you when each lipstick was manufactured. For example, if you look at Syrup, you can see it says AA1. The first letter is the batch number. The second number/letter refers to the month. September is month number 9, so October is month A because it can't be two digits long. Then the last number is the year, 1, which is 2011. Most makeup brands should have a label like this. I'm always disappointed when they don't.