OK - I have 5 pounds of Satin Ice - the pre-colored in blue. It's a little bright/dark for me and I want to try to soften it up. (Hopefully this is making sense.) It's going on dummy cakes for a cake show, so will exposure to sunlight fade the color a little? Or can I do something to tone it down a bit? Add another color?
The colored Satin Ice fondants are super-saturated so that you can custom-blend your shade by kneading the colored fondant with the white fondant.
so what would be the easiest way to get a wedgewood blue shade or something close to it?
Rather than adding to the blue, add VERY small amounts of blue to white until you get the shade you're looking for. I don't know if you'll get a Wedgwood blue, but you can get a pretty pale blue by just adding a smidge to white fondant.
If you need a lot of the same color, weigh your blob of white, then weigh it again after you've added the amount of blue you want. Multiply to make a big batch.
If you look in my pix, Bella's purse cake, the dark is the straight Satin Ice blue fondant. It does fade some as it dries. The medium and light shades are the same fondant with white added (tone on tone they call this.)