I use americolor gel and always find it is more purple than black/grey too. It drives me nuts. Maybe you could try a paste colour or a powder colour.
Another option, probably not for tonight but I good thing to know about, is LECITHIN! I’m sure there are other threads about it, but basically, it’s an emulsifier and by adding the same amount of liquid lecithin as gel color or powder, you get much brighter, truer colored fondant (and can be used in buttercream too).
Sweetwise sells it and has a great video showing examples (I think there’s even one of grey/purple fondant without lecithin, and then with it) and lecithin's other uses (look in the comments box below video for info on how much to use)
I bought my lecithin from a health food store, but it can be a bit hard to find unless you order it online from Sweetwise. Just make sure you get the LIQUID (actually, it’s kind of a thick syrup consistency), NOT the GRANULAR or POWDER (both of which are much easier to find than the liquid, unfortunately).
Good luck, and thanks to everyone else who commented on the black Wilton versus Americolor,
Alexandra
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