Filling a glass
with a dark liquid such as coffee or tea or soda is a common
technique for trying to bring out the best in a label but it
actually has the opposite effect! Invariably the label
disappears into the background.
This particular example is
about the worst I've seen because either the liquid used is
straight out of the fridge and it's cold enough to have allowed
condensation to form on the glass, or the liquid was spilled and
has wetted the label. There's nothing quite like getting a
pre-pro label wet for causing it to darken.