Yeast/Trub clumping up in stir plate starter?

[pixelmonk]

I had an old smack pack of London ale yeast that I decided to get up and running. I believe it was maybe 1 month past expiration on the pack. For the first day on the stir plate it was fine, but after that I noticed what all I can describe as "curdled" trub/yeast churning around in my flask. Has anyone ever seen this? This can't be a good thing, I would think, however, I wouldnt' know what would cause it to clump up.

[pixelmonk]

update:

I stopped the stir plate and let the stuff settle to see what happens. It went back to a powdery base at the bottom. It's just strange to see the stuff clump up in the whirlpool

[Dave the brew guy]

I had a Ringwood a few weeks ago that looked like that when I poured it out of the smack pack. It looked the same after a couple days on the stir plate, just more of it, but it took right off once it was pitched. I haven't pulled a sample yet to know how well it attenuated.

[DannyW]

That London yeast looks like cottage cheese. Perfectly normal. Brew on.

[BigBadBrad]

That London yeast looks like cottage cheese. Perfectly normal. Brew on.

Yeah, if it's anything like the English Ale yeast (WLP002), it looks pretty clumpy. I haven't used the London yeast, but it sounds similar. It's fine.

[pixelmonk]

cool.. thanks for the replies.