I had to make burgandy a while back. If I recall, I used a touch of black. If you have pre-made black fondant start by working in a little at a time along with your burgandy. If you don't just put in a little black with a tip of a toothpick and then add in some more burgandy until you can get the desired color. Also, I find that gumpaste darkens up a bit as it sits so go a tad lighter than you like and let it sit for a bit.
Here's a pic of my burgardy flowers. Hope this helps!
I had red fondant and added purple to it. I didnt go a dark burgundy though....so im not sure how that would turn out. Maybe purple and black to red fondant? Of course the best way is always trail and error. Just pinch a bit of fondant off and go at it 
Yeah I have the burgundy gel color too, for me to get the color that I wanted I used that and a little black. The black made all the difference in the world for me.
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