I would take a small quantity of the "purple" icing and put it in a seperate container and then try mixing a little red to it. Give it about 15-20 minutes to set up - don't cover it - let the air at it - then look at the color. Most colors darken as they set. I tried to do red, red, red roses once and the icing always looked kind of "orangey" but after letting the roses set for 20 minutes - they actually got RED, RED, RED. They were perfect. Time will tell the true color. Be patient. 
That's a good idea indydebi. My bride wants burgandy red. But, right now my burgandy red looks pink. How long do I need to wait to make sure it works?
Also, is raspberry color close to a cranberry or wine color? I have no idea. I am beginning to think that I am color blind. It does run in my family. Maybe I am just color unedumacated......
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