You can also use the eggplant petal dust and dry dust it on and when finished steam them. It sets the color and will look great. I do that with all of my flowers.
Like this one, or the sunflower wedding cake in my gallery.
http://cakecentral.com/gallery/1472020/first-official-cake
The cake I linked you to was the very first cake I decorated.
It has Hydrangeas that are made with white gumpaste then colored with petal dust (eggplant) and steamed to set the color. I believe I used 2 or 3 containers of petal dust to color these but if you start with a gumpaste that is tinted close to what you want you will use less petal dust.
That is what I did on the Sunflowers, I started with a light yellow gumpaste and add layers of different colors of petal dust to get the effect I wanted. I bought a DVD from Sharon Zambito that shows the technique that I used on the sunflowers.
Thanks for the compliments on the wedding cake. This cake has turned out to be my favorite so far.
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