I need to get a rich "eggplant" color for my royal icing. I have used Americolor's violet but even 2 bottles didn't give me a deep enough color. So I added some burgandy, black, and duff's electric purple just messing around with it and still can't get it right. Please help!

I used violet and black to get the color on my wedding cake with ivory roses (sorry can't seem to attach it) Is this the color you want or something darker/deeper?