Yes, and it has taken on a darker hue to help with that warming effect. Many species of dragon can change from lighter to darker colours in response to things like substrate and air temperature. This occurs by changes in the distribution of pigments in special pigment cells.
Hi WillO and wombey, thanks for your comments, I didn't know they could change colour, but at the time I was surprised by its notably 'black' look too, and I was wondering a bit...