Is there any reason why I shouldn't color a batch of fondant while mixing the ingredients in my KA? Obviously I want a lot of the same color & didn't know if adding color to the fondant in the "mixing stage" would compromise the final product. Thanks.
Well if you're doing MMF I have found that adding the color to the melted marshmallows is the easist way. It's easy to see what the final color will come out to be. It will be the same as what the marshmallows are, only dull, not shiny. So it might even appear about one shaded lighter, but that's much easier than re-kneading the whole batch and getting color all over your hands.
The only thing to watch out for when adding the color during the mixing, is the consistency since you're adding slightly more liquid. But it would be the same (I think) even if you added it after you finished making the fondant.
If I have a large batch of one color I put the color in during the mixing stage, but I have learned, perfect the color that you want when you are melting the marshmallows rather than when you are mixing it in the sugar. For some reason, if you do it when mixing in the sugar stage, it does not turn out right.
I've only worked with MMF and similar to mmgiles I add the icing color right after melting the marshmallows and before adding the powdered sugar. The color turned out the same, just not so shiny, after all was said and done. Hope that helps!