So I posted a picture of a margarita we had at a newly opened restaurant near us and one person commented that what is clearly a shadow might be a fill line. But the thing is, the fill line is about 1/3 up and she swears that this is a common thing. So I have never seen this before in my life; I cannot find any examples of it on the internet; and I cannot imagine a single advantage that this would provide. Any experts out there care to enlighten me?
My wife (the professional photographer in the family) took this shot which does a better job of showing no fill line.
I’ve definitely seen glasses that had markings (such as through changes in glass thickness) for a certain pour amount like 2 oz. Though this one could be for better stacking such that the two glasses won’t get stuck together which could end up with one of them breaking in the process of removal or such that the glasses are more safe to stack several high without any cracking or breaking.
I’m sure that’s it. A somewhat common practice in high volume beer joints.
I’ve seen it quite often on beer and wine glasses to show the customer they are getting a proper pour, but this was 1/3 of the way from the bottom of a Collins glass. Who serves glasses 1/3 full of anything?