For the record, if liquor is coloured, i.e. not clear - it has tannins in it. Liquor with tannins tends to give you more a a head ache than clear liquor.
http://www.whisky-distilleries.info/ArtDeBoire_EN.shtmlYou're right in that ice messes with the aromatics and it also anaesthetizes the papillas on your tongue, thus detracting from the experience of drinking a good scotch.
