I gave this a try last week, saving a lump of dough in a plastic container. A couple of days later I used it to make a loaf. No extra yeast and it was fine. The bread was similar to my normal bake. I did it late at night and proved it in the morning, so I didn't look too closely at the starter.
Today I went back to make another loaf. When I went back this morning to use the starter,it had been resting for twice as long, four days, in the cool dark pantry, as I started to tip it out, I noticed that the top surface looked a very "slimy grey". It smelled OK, but I haven't used it. Would you think it was OK?
Here's a picture I took an hour ago. I've left it out on the counter and the grey seems to be disappearing into the rest of the starter. I have no experience of this sort of baking, so I'm looking for some advice.
