If you search using tiffany blue search all terms limit to the titles
you will find many threads for the same question.
Here is alink to one: http://forum.cakecentral.com/cake-decorating-ftopict-449043-tiffany.html+blue
I always find doing it in the liquid part of the MMF helps a lot. Or maybe do a light base of the color with the liquid then adding in the extra color to get it the right shade by kneading it.
I used aqua by wilton and added a touch of leaf green - but I would do the green last if you are not happy with the aqua by itself.
I used sky blue Americolor for my Tiffany box cakes in my pics, added to MMF at the liquid stage.
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