Last week I decided to try and start blending some fragrance oils - to be honest, I had no luck. For instance, I did a blend of carrot cake and coffee (20% coffee/80% Carrot Cake) when the tart started melting, all I could smell was the coffee. Tried another blend of Raspberry and Sugar Cookie - all I could smell was the raspberry. So, I have to ask - is there a specific formula for mixing scents ( I know, it's a dumb question) or is it just trial and error?? I have ordered a few tarts from a company online and she has tons of tarts that are a mixture of scents and they always smell amazing - when I try, it's a flop. She turns these things out so fast, it's hard to believe she is testing them all. So I'm wondering, is there a trick to this or just blend and be happy with what you get?????? This is so frustrating! Thanks in advance for your input!