"Things You Wouldn't Know If We Didn't Blog Intermittently."
That's not the grossest thing about eating a McDonald's snack wrap.
I used to carefully cut off dates printed on cheese until I was informed that they were printed with grape juice
Seems as though the tortilla could have been wrapped with the edible date on the inside, to never be noticed in the first place.
Anonymous is correct. Substances such as grape and beet are used as food safe ink for printing on food.