I use a sheet of aluminum foil.
I’ve been doing this since my stir plate died. I follow a two step process with a 2qt starter that I allow to ferment out, crash and split. This gives me a little extra insurance that my yeast is good before I make my shaken starter brewday morning.
I'm lucky to have a yeast factory in the neighborhood. They don't sell to individuals, but I can get less than 7 day old packs every Tuesday at my LHBS. I shoot him an email with a will call list, and add Kellers to my wife's shopping list. Rarely use yeast over a month old
How can you see if a shaken starter is infected? You could taste the one made on a shaking plate after a cold crash.
Quote from: filipp on January 22, 2021, 11:52:55 AMHow can you see if a shaken starter is infected? You could taste the one made on a shaking plate after a cold crash.Why would it be infected?
Quote from: denny on January 22, 2021, 04:02:43 PMQuote from: filipp on January 22, 2021, 11:52:55 AMHow can you see if a shaken starter is infected? You could taste the one made on a shaking plate after a cold crash.Why would it be infected?Exactly. If infected starters are an issue, then you have bigger problems to deal with. A SNS starter takes off pretty quick, so you would likely need significant contamination to end up with an infected starter.