Then, when they glued it back on, they smeared a big blob of epoxy on the gold leaf. But that's not the only botched restoration job. The Telegraph mentions a few other notable cases.
Cecilia Gimenez's restoration of Ecce Homo
Yunjie Temple before and after.
The bungled nose job on Supper at Emmaus by Veronese (from the Guardian)
Read more: "King Tut's broken beard and other art disasters" at The Telegraph