coloring candy melts Tiffany Blue
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A simple Google turned this up. If i read it correctly she used just Blue a tinny bit at a time no green at all. If you scroll down a bit, using this method she was able to match the color pretty much exactly.
No problem. I also read to omit the green and try mixing teal and sky blue. 5 drops of teal to 1 drop of sky blue, but you have to adjust based on the amount of chocolate you use. I would start with the 5:1 ratio, and if it is to dark just melt in a bit more white until you get your desired shade.
This person was making macrons and used sky blue and leaf green.