Originally Posted by diegobonatto
Depends on yeast strain type, fabrication date of vials, how they were stored by the supplier, etc....
But, take you a hydrometer read? Some yeast strains do not form an active krausen on wort surface.
Its only day 3 at most so I will probably wait a bit to take a reading; but the yeast used was Czech Lager WLP 802
Best before date of Aug 12 2012
* If I did not mention this before I do think the yeast is good [at least part of it] since a minute amount was present in the vial after pitching and I added a bit of water and sugar and it is active at room temp.