it wasn't mixed well enough.
also added salt and different exposure to light as it's used can effect color
here's a thought for you--mix the color into a small amount of icing--a nice dollop off the spatula- i mix color with the metal spatula onto the clean counter top (or you might want to use a tray or the back of a tray) so that you can smear it out as thin as possible over and over and you can see that all is well combined--then mix that into the big batch--
mixing in a bowl--even a mixer sometimes will leave streaks and pops in icing color
♥
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