Very good explanation. I get it. The rabbit hole is deep.

Is there such a thing as a one run sour mash ? Grain wise.
I have some back set from a previous run So can I double ferment that grain and get something like sour mash?
On my next run I'm using backset and tails in the boiler and heads in the thumper. Corn/ barley and rye.

Thank very much for a direct answer.

Howdy folks brand new here and looking for some advice.
I'm running a corn/ Sweet feed run and wanted to know if I could save and use some back set from this run for my next run which would be a different grain bill. Corn / barley/ rye. For sour mash. Didn't know if using 2 different mashes would ...