[Bizzy Bugz]

When you proof the yeast in the warm milk or water add a little sugar. If it does not bubble up a little when proofed, it is not good. Do not use it.
I test the water on my wrist. That is the best place to test if it is just warm.
Hope this helps

[RandallFlagg]

Thanks. The yeast is still good until next year. I always keep it in the freezer, and let it get to room temperature before adding it into the mix.