What should the froth look like?
As frothy as can be! It should also be frothy all the way through a healthy starter will also have lots of visible bubbles along the side of the glass (an excellent reason to use a clear container instead of, for example, opaque pottery). A starter with bubbles only at the top isn’t doing so well and may require an Old Yellering. A friendly reminder: Sourdough is a closed email topic.
