Thanks for your in-depth answer. I will try that process out later on, when I have the time. The mold I need to produce need not be realistic. I am actually copying a client's logo, we copied it from their concrete bas-relief. The bottom is square and flat, the top has the flower design(hibiscus-like with many thin petals). The pastry chef I work with recommended using silicone vs the plastic because the details would come out better. Now I'm trying to figure out if it is worth the trouble. I have somebody who has carved the logo in hard bar soap/clay (that was th requirement of the custom-made mold maker). Thanks for your help!