A friend of mine was going to toss out an old, unused vial of WLP802 Czech Budejovice Lager Yeast with an expiration date of Sept 2010. I took it off his hands instead and am making a starter to try and salvage it. My first step is 500ml of 1.040 wort on a stirplate, but there's very little sign of any activity. In all my previous starters with fresh yeast, it's pretty clear when to decant and add more starter wort. With this one, I'm not sure. How can I tell when it's time to step up the starter? Taste? Amount of yeast in the bottom after cold crashing. Should I have used a different procedure in the first place?