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My sourdough starter is 2 months old. Some week or two ago it started to have a crispy skin on the top. The smell changed a bit, but it is still sweet-acid smell. I cover a jar with the starter with a kitchen paper towel. I replaced the jar with a clean one but the skin persists.

The bread I got from it is still decent.

Is it mold?

skin

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I would guess it is just drying out. I keep my covered. If it is on the counter preparing to be used, it is in a jar with a loose lid. If it is the refrigerator, for longer intervals between baking, it is in a sealed plastic pint container.

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