Sourdough Bread Not Rising
I started a sourdough starter using only bleached white flour and warm tap water 2 days ago. On the first day it just had a few bubbles, but by this morning it had a huge number of bubbles on top, white foam, and a very large amount of liquid sitting on top with a strong smell similar to soured milk. I decided to try making a loaf out of it, since even though it was extremely early it matched the description of "ready" I had read in several articles. I fed it a extra cup of flour and an extra cup of water, and let it sit for a few hours. It again grew very bubbly and foamy on top with liquid, and so I took one cup, added shortening, salt, and sugar, and kneaded in flour until it was about perfect dough consistency (or at least I, never making a loaf of bread but cooking quite a bit of other things in the past, think was perfect - wet but not so wet that it sticks to things and leaves dough behind). I let it rise in the oven with the light on after heating it on 150 for 60 seconds to give a little warmth, letting it sit for about 4 hours. It didn't rise the slightest bit, and there was a shell-like layer of hardened dough on the outside. Does anyone know what I did wrong? Perhaps the oven heat was too much and it cooked it a slight bit, killing the yeast? I'm not sure, since the starter seems very healthy, though it doesn't rise much.