Q.ARE YOU LYING?
I have asked a real life expert after many arguments with my friend that limes are not in fact yellow when fully ripe. This website has officially made me lose my status of the “smart one”. I was unable to find a report button on the information. Limes do turn yellow but that is with too much sun exposure. Limes are green. You are liars. I am ANGRY.

Nope, we are not lying!
Green limes are, in fact, underripe. When allowed too fully ripen on the tree, they turn pale yellow.
The truth is that when you see a partially yellow lime, it’s yellow for one of two reasons: Either it’s ripe and less acidic or other fruits or leaves blocked its sunlight while it was still on the tree.
Commercial farmers don't pick each lime individually as it ripens, They strip all the fruits of each tree at one time, and they do it when the majority of the limes are still green because green limes travel better.