lol I figured something like that. I usually end up with purple rather than green.
The only time that I have ever gotten a really nice gray was when I mixed all of my leftover fondant scraps together.....it turned into this beautiful charcoal gray. Hopefully someone else will have some input for you!
I think it's your Wilton. Maybe it's old or something. I use Americolor gels and they are pretty true to color. You might also try buying black ready-made fondant and adding the white to it. I also think a tiny touch of purple can add a grayish cast.
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