Using Old Hops

[Radobrewer]

How much do I account for when using older hops? I have Nugget hops from 8/20/11 that were 12%. They have been vacuum sealed and kept frozen/out of the light. I need 1oz of these for bittering in my recipe. How much more should I add?

Any help is appreciated.

 

[iaefebs]

BeerSmith adjusts the Alpha to 9.95, but hey it's not science, it's art. If you trust BS you would add 1.2oz