Is this mould?

[jceg316]

I put some yeast in a starter to culture it up and once done I put in a jar in the fridge. A month or so later I opened the jar to make a starter and saw this on top:

The yeast is WLP920 Old Bavarian Lager yeast. Is that white stuff mould?

 

[Leon103]

Hard to tell. Also looks like oil

 

[jceg316]

They look like white flakes floating on top. Those which are on the inside lip of the jar look a bit like bacteria.

 

[jceg316]

Just bumping this in case anyone can help.

 

[foxbat]

I'd say it's some form of infection. Looks like it came from the lid and sides.

 

[An Ankoù]

Any smell of vinegar?

Doesn't look like mould, by the way.

 

[An Ankoù]

Just bumping this in case anyone can help.

What? You've kept it since 2014?

 

[jceg316]

Any smell of vinegar?

Doesn't look like mould, by the way.

No vinegar smell, it actually smells fine, but as it's been in the fridge for a few weeks it might be slowly developing. I have found previously that not all infections smell sour or even taste sour, but can ruin beers with other flavours.

 

[Sadfield]

It does look as if something has made a half hearted attempt at forming a pellicle, which has then broken up into flakes.