While I don't like to essence up any liquor, my brother loves the flavored drinks so I keep some on hand.
Here's what's in two Prestige essences right off the label:
Prestige Irish Cream: Flavorings, Glycerine, Invertose, Distilled Water, Caramel Color E150A.
Prestige Whisky Liqueur (Drambuie): Flavorings, Tannin, Glycerin, Invertose, Distilled Water, Caramel Color E150A.
And of course, they both call for some granular sugar to be added.
So I guess the big question is, what's in the 'flavorings'?
I found this:http://grapestoglass.com/product-category/liquors-spirits-misc/essences/