Sweet cups with special effect

Bought without great expectations these cups. After the first rinse then tested .. As the Espresso ran into the cup, the whole cup of the hot liquid discolored. There was a wide strip which then grew brighter and wider. After some use, and repeated rinsing in the machine, this effect is leveling out. The cups are made of colored glass, through the rinsing in the machine you can see the glass top on the edge more and more, minor nuisance. Because I can imagine how the cups will look in a few months. Therefore, a point deduction.
It not only fits into a small espresso, for the drinkers from the double so suitable. By and large, but ok