More C02 dissolved in solution when it was cold, so it didn't "pop" as much when you opened. Then when you poured, the colder beer didn't just release all the C02 when it hit the glass. So you didn't get as good of a head, but I bet it kept bubbling longer than the warmer one. Just pour a little more vigerously if you want a bigger head...although red ale generally isn't a real "heady" style. Take them out of the fridge 15 mins before you are going to drink if you want so it warms up a bit, probably too cold right out of the fridge anyway.
Last edited by steelerguy; 03-20-2009 at 03:52 AM.