I think I goofed! I'm making about 30 gumpaste roses. The bride requested deep red roses. After completing the rose petal layering, with each layer gradually getting a little lighter per layer, I went to darken the edges of two roses with a deep color chalk. The roses were not red enough. So I called my local cake/cookie decorating store and asked if airbrushing the gumpaste would work without making them shiney. After getting an affirmative answer and adding the color, I hoped the roses would dry and still look dull not shiney. Well, they are dry and still shiney! I like the deep red color but I don't want the shiney look. Attached is a photo of the airbrushed roses and one un-airbrushed rose on the right. Can you suggest anything that I can do to make the deep red roses dull?
Thanks, Trudi, but I tried to do that already with petal dust and then with artist chalk. It did not dull them nor did it give them more depth. Afterward, I resorted to trying a little contrasting gold luster dust. That did not solve the problem, but it did give an interesting effect. 
Initiall,y I used Americolor Red Red Airbrush liquid in my airbrush cup. AFTER letting the roses dry, the following day, I first tried the chalk (Didn't help!), then I tried a couple of different shades of luster dust (Didn't help!, and finally I resorted to trying luster dust (No help there!).
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