Americolor has great colors…I would go with royal purple and add in some royal blue. Also remember that purple (like reds and black) darken over time so make the day before. If the next day it’s too dark, you can add in some more icing a little at a time until you achieve the color you need. If it’s too light, you can add in some more blue. Good luck! :)
Thanks I will check out the Americolors!!