blisters on bread

Toast
Does anyone know exactly what are the small blisters that surround our long fermented sourdough breads are. I normally take it to mean a positive thing as most wholemeal products need this to get rid of phytic acid.

Here's how those blisters were explained to me: when bread is retarded or otherwise fermented for a long time, the gluten starts to degrade. These little breakdowns in the gluten cause "micro-chimneys" to form, which, during baking, carry gas up to the crust causing the blisters to form.

Susanfnp

http://www.wildyeastblog.com

Is this normal (I have it on nearly all my retarded breads) or something that causes a sub-par loaf?

Toast

I heard that about the French--those crazy French!  I like them myself; they add texture.   I was just wondering if since the gluten starts degrade a bit, if it results in a loaf with reduced volume.

SOl