Originally Posted by
TimF1975
I'm pretty sure they are color coded so easily detected by most conductors. I have seen them rejected before but then again when I was riding Metra every day, I saw a lot of things.

Actually the only color-coding on the 10-rides is per zone. More often than not, date stamps are in black (IME). They've changed formats a couple times in recent years, but that's not always easy to judge either.