I have a fairly strong starter that is at least 2 years old (bought from someone so probably much older) I’ve never had any problem getting it to come back to life after neglecting it - even left it in the fridge for about 6 months untouched. However, recently, I left it a bit too long on the counter without feeding and some hooch developed, I poured most of it off and fed it and ever since it has a blue/gray tinge to the top half of the starter. I cut it way back, to about 10 grams, and built back up, but still always regrows with the top 2-3 inches gray! Any idea what that’s about?

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