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WLP 007 Starter question

I made two starters at once yesterday: 3L of 001 and 1.5 of 007, so 4L total of starter wort. The 1.5L starter with 007 and it never built up a krausen . None at all (it’s been 22 hours ago now).

The “best by” date on the 007 was October 20, 2012, so I think it was 6 weeks old or so. I make my starters in growlers and shake them up every time I walk past them for the first 12 hours or so. The 007 gasses off still when I shake it (quite a bit, actually), but no krausen.

Anyone ever experience this? Any idea why this might happen? Is it still OK?

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