Some threads on maroon colours:
Hope this is not too late... I make Michele Foster's Fondant, and add the color in the liquid stage. I found that Maroon, and a little Brown make a good color. I did find that adding a lot of color made it a little soft, so next time I am going to add a very little bit of gum-tex or tylose to it to firm it up a bit...
Here is the fondant recipe:
Here is a cake that I did with a lot of Burgundy fondant...
I just used americolor maroon.. and just kept adding till I got the dark maroon... you really don't need to add a thing to the americolor maroon to get the true color