The gold funeral mask of King Tutankhamen has been returned to its home in the Egyptian Museum after eight weeks of delicate surgery to undo damage caused by a botched procedure last year to reattach the boy king’s blue-and-gold braided beard to his face, the country’s Ministry of Antiquities said in a statement.

The procedure that damaged the mask was a hurried repair job by museum workers after they accidentally knocked its long, proboscis-like beard off its golden chin in August 2014. The accident happened while they repairing the light fixtures inside its display case.

In a rush to fix the problem they just made it worse by using an insoluble epoxy resin that left a visible, crusty ring of glue around the base of the beard. The mask’s chin was also scratched.

After the damage was discovered last January, one of the museum’s conservators described the epoxy to reporters as a “quick-drying, irreversible material.”