I have made a batch of Indebi's (sp?) buttercream and the sky blue food coloring doesn't seem to be mixing well. It it blue with lots of white streaks and I mixed it for a good 10 minutes.

Any suggestions on how to get the color to stick to the icing?

what type/brand of food coloring did you use?

Instead of mixing your color into an icing made using water, use whole milk instead. Have no idea why this works but it does.

I used sky blue Wilton brand and no water in the recipe just milk

Next time try adding the color to the liquid before mixing it into the icing. This help distribute it better.

Several things might be going on. If you used a store brand powdered sugar, this might be part of the problem...next time try switching to a good name brand that uses only CANE sugar.

Second, if you skimped on the Dream Whip (which has lots of emulsifiers) it might affect the way the icing accepts color, because Crisco by itself doesn't color well since they changed their formula to eliminate trans fats.

Third, is the icing pretty thin? I've had trouble tinting some of my icings when they're thin (especially with blue, for some reason!) Try adding powdered sugar to thicken it up.

Fourth, this is a long shot, but did you substitute some of the shortening for margarine? When I've made icings that contain a lot of margarine (we have milk allergies in out family) they don't always color easily.

hth