Fondant colouring colour chartThe top value is cyan (blue), next is magenta then yellow and finally black. Each value is out of 100. So to make the first light grey colour add a small amount of black. To make the first green on the bottom row you would need to add a lot of yellow and some blue and black. This is not an exact science.
Helpful for decorating sweet treats with natural food colors. They now make an orange color that produces anything from a pastel to a bright orange, so you don't have to blend. But I couldn't manage to pin that one.
aqua, teal, turquoise, navy Using experience and a handy color chart from a veteran cake decorator, I tried to put together a little guide to refer to while mixing icing colors. -says the originator of this info