I am brand new at making sourdough, and I just began cultivating my first starter (pictured here) on May 5th -- about four weeks ago now. I fed it twice a week for the first week, and by the end of that week, it was looking quite bubbly and healthy and smelling lovely. I've successfully used it several times now to make bread, waffles, muffins, etc. However, within the last few days, it started to develop these strange orange/brown flecks. At first, they were only visible towards the bottom of the jar, but now, they've started spreading up the sides as well. I can't tell if this is totally normal or if these are signs of a deadly mold. The starter still smells like fruit and bread, just like it's supposed to, and it's still doubling in size each time I feed it. Does anyone know what these spots are? Is this still safe to bake with, or should I throw it out? Any feedback would be much appreciated. Thank you!