Actually, this process is fairly forgiving, so any room temperature butter should work. We define "room temperature" as between 68-75°F and offer this helpful tip in our recipe success guide:  Butter temperature, salted/unsalted butter: If the recipe calls for room-temperature butter and yours is cold from the fridge, place wrapped stick in a bowl of barely warm (73°F) tap water for 10 to 15 minutes before using. 

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