You can leave them as is, however steaming them sets the colour and adds a richness to them. I had to make burgundy Calais lilies, but couldn't get my gumpaste the right shade. I dusted them in red, and they looked okay, than I steamed them and they looked beautiful. The colour blended into the gumpaste and it was like magic!
I truly don,t think it makes them look darker. It does give a little shine and realistic looking. It sets the dust also , so as not to smear on things. I have always steamed my flowers of all kinds that i make. That is what i was taught and still taught to this day. hth
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