The posts are from before they lab-tested if it was contaminated; and no news since aug 2019? Likely, it was contaminated and not ancient. Yeast/bacteria is ev

The posts are from before they lab-tested if it was contaminated; and no news since aug 2019? Likely, it was contaminated and not ancient. Yeast/bacteria is everywhere. Any flour/grain can be turned into sourdough. The "feeding/culling" process ensures whatever strain is strongest/adapted survives that day.