The English satirist, William Hogarth, used the figure of the black servant in two of his series of works, The Harlot’s Progress and Marriage à la Mode to pass comment on both the moral status of his protagonists and slavery itself.
A fascinating example, though, of how fashion and attitudes change is the portrait of the Glassford family painted by Archibald McLauchland around 1767. It seems that the painting once contained the figure of a young black page, later painted over, possibly because of anti-slavery feelings. Glasgow Museum's conservators have undertaken a project to put the figure back into the picture.
from: Real Histories