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Q: I used Roeselare (or some other commercial mixed culture) and it did not sour yet. What do I do?
A: Sometimes Roeselare and other mixed cultures don't get the acidity that you might want. If it hasn't been a year yet, waiting longer may help, but sometimes it doesn't. If after a year the acidity is not high enough for you, try adding fruit such as cherries or raspberries. The fruit has citric acid various acids in it, and the sugar content will partially be turned into lactic acid by the surviving bacteria (the brewer's yeast will be dead after a year). Brewing with no hops and a very high mash temperature (158°F-160°F) is highly recommended for next time. For more information, see [[Mixed_Cultures#Wyeast|Roeselare]] and [[Mixed Fermentation]].
==What happened to my head retention==