I took my Balkan recipe to the next level by making a press tool so I can create a flake.
I've thought about doing this over the years.
I made a wooden box for pressing flake. Let it sit for a few days, opened it and it was covered with mold. I contacted Craig Tarler at C&D (this was back in 2008 I think) and asked him what they did to prevent the same thing happening. He mentioned a mold-preventing chemical that they used. He sent me a tin of it. Though I never used it I wish I had written down the name of the chemical and the dose; I'd send you some if I had kept the information.
Pipe smokers den has a thread on the subject. There are some great posts from Ernie at watch city cigars on blending and infusing.