12 hours ago, Jim D. said:
I'm glad you brought that up. After an experience like pastrygirl's, I bought some sorbic acid to add to ganaches, but have not been able to find the correct amount to use.
i believe wybauw recommended 0.1% (presumably by weight) for centres after adjusting the pH to 4.5. i'll dig around in some food journals to see what else we can find.