to get a turquoise color? TIA!

You can mix sky blue with a little yellow. Or Americolor has a great turquoise - looks like Tiffany blue that you can just use straight out of the bottle.

this color chart reccomends using 6 parts sky blue to 1 part lemon yellow to get turquoise. Hope that helps.

http://www.bkcompany.com/default3.htm

Click on food color facts and then in the top corner to download color wheel chart.

I mixed up a double batch of SugarShack's Buttercream (and for the record, that A LOT of buttercream!) and stupidly colored it all Wilton Leaf Green.

What colors can I possibly turn it into now?

How would I do that? Just add blue?

I know yellow and blue make green but I don't know what green plus other colors makes.