Neeson worked in ten-piece prosthetic makeup, sometimes for 18 hours. He saw the lengthy time spent in extensive makeup as a challenge and liked "the idea of working behind a mask on camera, and just exploring the possibilities of what that entailed." He and makeup effects designer Tony Gardner did tests using specific glues, foams, and bandage coverings. They also timed how fast they could apply the prosthetic makeup and put the costume on. Neeson worked with the costume designer on his outfit, including aspects like the cloak. The hardest part for the actor was speaking with false teeth and he ended up doing "a lot of work on my voice – I didn't want the teeth to move at all."