I'm trying to reuse my yeast from a previous batch. I washed it, stored it for a week in the refrigerator, made a starter as explained on many website, pitch my washed yeast into it.
For the details, it is in a 500 ml glass vial with a soft plastic cap that allow CO2 to get out a little.
BUT ... yes but how can i see if my yeast is active ? what are the signe ine the vial that let me know that I will be able to use it in my next batch tomorow ?