We think that sourdough bread has to be heavy and acid, and that it is absolutely impossible to make a fluffy, light and mild flavour loaf just with sourdough. So it would be impossible to make a Sandwich loaf just using sourdough.
I obtained this formula checking the TXFarmer blog in Thefreshloaf.
Yeah, my sandwich bread is always 100% sourdough, because that is the only kind of dough I make. My wife doesn't like sour bread, so my sourdough is not very sour at all, but still full of wonderful flavor. With a few extra days in the fridge, it's awesome for pizza crust, too! Yours looks better than mine, though. Nice, even browning on the crust, and an airy crumb.
Ying will be pleased your take on her recipe came out so well.
Looks great! Nice job.
Thank you! It's a great recipe. I'm pleased to TXFarmer for the formula. Almost 0% sourness in a 100% sourdough loaf. I can't believe it!