Hi again!
I posted a while ago abour switching to IMBC.. I learned the hard way that normal wilton and Americolor food coloring will not work, so I purchased some powder stuff, however, I cannot get it blended in! I have little specks of colors..... I beat the heck out of it and still not blending!
The recipe I am using now is Sylvia Wynstock's buttercream, made out of pure egg whites, a cooked sugar syrup and butter.
I had used another recipe that had whites, sugar syrup, and a mixture of butter and Crisco, and it seemed to so fine when I used my normal liquid coloring.
SO.... do you thnk I can just add some Crisco to my buttercream,and ue normal Americolor food coloring? Or is there anyway I can get the "specks" to dissolve quickly?
I am making deep blue and deep red, and have to have this done for the event tonight. Some of you may have read the post on the bounced check from a customer, where it ended up being my banks error.. THIS cake is for that customer- I'd like it to be wonderful for him!
ANY THOUGHTS OR HELP SOOO APPRECIATED!!
I'd love to help you but I don't even know what IMBC is - I know it's a kind of buttercream, but don't know what the IM stands for....sorry!! 
I have found that it's difficult to get a strong/deep color in IMBC. I have played with it in the past and found that adding the color to the sugar syrup right at the end of the boiling time is the best way. However, I think that your "flecks" problem is with the powder; it almost wants to be a liquid in order to blend in seamlessly with the icing.
If you are making a large batch, try adding some of your Americolor to what you've already started to color. That might be enough to even it out.
Generally I don't like to make a deep color in IMBC because I find that it is difficult. Pastels are much more lovely here, but ... if you have the supplies and the time, start again and add your color to the sugar syrup so you can get that deepness up front. You may end up with more of a color than you want, but it may be the price you'll have to pay.
I hope that this helps you out. Good luck with your cake and post photos so we can drool over your great work later!
Odessa
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