Today as I checked on my sourdough starter, I noticed some dry white patches on its surface. Has it gone moldy? If so, is it safe to just scrape off the mold and use the remainder as usual?

The sourdough smells cheesy / yeasty, nothing that yells "I've gone bad!" at me. There is no liquid on top. I've left the jar open for the last two days covered with a cloth, can it have anything to do with it?

Picture of sourdough in jar Image source

  • Definitively looks like mold, the rest is a duplicate of some other questions about moldy sourdough.
    – Stephie
    Oct 28, 2016 at 17:37
  • You might also try cleaning the walls of the container, so that the not quite sourdough stuff does not then grow and fall down onto the main colony; cleaning the sides or using a new container appears to help the health of the colony I maintain.
    – thrig
    Oct 28, 2016 at 20:00

1 Answer 1


Scouring the internet a bit more, apparently the crust was some nitrogen-hungry form of yeast.

However, I did as suggested in this similar question, discarded most of the sourdough and used a bit of it to start a new one. Wish me luck for it!

  • Aaaand same result :(
    – Thaoden
    Oct 31, 2016 at 8:03

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