Montrose's black servant: factually correct as in the 'Culloden Tapestry
This Rob Roy film begins three decades before the doomed battle of Culloden in 1746, and shows a black servant boy (debated in a thread before, although I couldn't see what prompted it) but this practice was in keeping with the fashions of the day.
Many nobles valued their fashionably pale skin- showing that they were rich enough never to need to work outside- being contrasted with the dark skin of a slave servant.
This Tapestry shows just this;-
Mystery over Jamaican at Culloden
By Steven McKenzie, BBC Scotland, Highlands and Islands
http://news.bbc.co.uk/1/hi/scotland/highlands_and_islands/7027840.stm
Historians puzzle over black face in ancient tapestry of Culloden battle (The Scotsman, 2007)
http://www.scotsman.com/news/scottish-news/edinburgh-east-fife/histori ans_puzzle_over_black_face_in_ancient_tapestry_of_culloden_battle_1_69 4194