[quote=“Shenanigans”]Im using a brown glass growler as a yeast starter. It is really hard to tell if the starter is working or not. It has some foam but not like krausen foam, more like foam from star san. Everytime I shake the starter I have to watch to avoid having the foam come out under the tin foil.
I boiled 3/4 cup of DME and added 1.5 liters of water, would you recommend I do another mini-starter before I pitch to ensure there is enough yeast cells? Or am I just a newbie who is worrying too much?
I plan on brewing the black ipa on Sunday so I have time.[/quote]
I think you are fine with what you have. You won’t get a krausen because you are continuously (or intermittently you might say ) adding new oxygen and releasing built up CO2. The foam is the indicator that the starter is working.
A suggestion I have is if you possibly can, use weight for your DME instead of volume. I bought a cheapy 1lb scale (grams & oz) for $10 to weigh out priming sugar and starter DME. The easy way with weight and the metric system is 100 grams for every 1L. so 150g for 1.5L gets you around 1.038.
All-in-all, your starter will be ready for the Sunday brewday.