Last month, viewers were distracted by Robert's appearance change when Michelle Connor visited him in prison, with Gemmill later joking about the fact that Robert got a tan when in prison too.
His new look was brought up by Dan Walker when he appeared on today's (November 22) BBC Breakfast, and Gemmill insisted that it was all planned.
"It's caused much more of a fuss than I really thought. He goes to prison for six to eight weeks… and when he comes out, his hair is a different colour. Didn't necessarily explain it, but there are explanations out there," he explained.
"It was a deliberate thing. It wasn't like, 'Oh continuity, someone forgot'. We knew what we were doing. Maybe there's no hair dye in prison, or maybe he got so worried about not saving his girlfriend's life from a crazy, wacky stalker that he went grey overnight."
Robert may now be out of prison, but his life isn't getting any easier as he receives a devastating cancer diagnosis in tonight's episode.
His emotional story kicked off last week when his girlfriend Michelle (Kym Marsh) told him she'd felt a lump in one of his testicles and urged him get it checked out, which he eventually does only to have the doctor confirm his worst fears.
Coronation Street airs these scenes tonight (November 22) at 7.30pm and 8.30pm on ITV.
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