Pattern loses its color

From a distance, the cup looks great. But you look up close, you recognize exactly what area the pattern was applied to the cup. (A large rectangle once the cup rum.) Here's the cup no longer perfectly black, but has a slightly blurred. Moreover, it was still a small quirk in the field of fish.

There should be no special cup now anyway, it suits me but. Served its purpose.

Acts otherwise stable and the dishwasher has not been harmed.

Addendum: After a month in use now but solves the letter color.
Presumably, after 3 months off the entire script and then you have a motiveless cup.
Very unfortunate.