There are plenty of calculators that tell you how much starter to make for a specific amount of starting yeast and for a specific gravity of the wort. On packages/vials of yeast it tells you the ...
Just like the title says: how long does harvested yeast keep? I am assuming to keep the yeast you have to store it in the refrigerator, right?
Looking at this video I had the idea of vacuum sealing yeast that I harvest from my beer batches to better protect it from bacteria/mold. My plan is to rinse the yeast with boiled (sanitized) water ...
I've done yeast starters and I've re-used yeast beds but I have never previously harvested or captured yeast from a commercial beer. I tried it last night, inventing my process as I went but I'm ...