Is she mixing the color into the fondant or airbrushing it on?
also depends on how much fondant she is coloring. To get black when starting with White it usually helps to color it brown first, then add the black. Also if she lets it sit overnight the color should darken some.
Is it fondant she bought? or fondant she made? (wont' make a difference on coloring, but if she made it, it's easier to mix the coloring into the liquid before adding the powdered sugar - uses a lot less color and uses a lot less muscle)
It usually doesn't take much for me, but it does darken as it sits. It is good to color black the day before to it can set up.
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