Sort:  

And remember to use warm water as well, just dip your finger in it to test it. I was using dead yeast for ages, wasted so much time and effort all those months 😣

Absolutely. I actually do this when I make beer. But I buy the yeast fresh, so it doesn't need to be tested. However, I do put it in some warm water before I'm ready to cast so it gets a head start.