Have you tried adding purple? I would try a couple of drops and if that doesn't do it add a drop of black to the mix.
If you just can't get there another option is to get a good base color that is in the range you want to go and then use a petal dust the color you want to achieve either dry or mixed with vodka or extract to use as a paint. If coloring a large area you can sponge paint it on or apply with brush.
Newbie,
Good idea, sometimes by the time you add enough color the fondant is too wet.
Mustard Seed
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