Liquor + Air = Vinegar: Make It From What Grows Here
The question held since Joe's talk comes back: must the vinegar be brown rice vinegar? Kim Chang, the interpreter, answers first in her own voice (4-5% acidity, and why competency matters), then Cho takes the flip chart. Don't insist on brown rice: carbohydrate plus nuruk makes liquor, the air's acetic acid bacteria turn it to vinegar in 3 to 5 days, and the material sets the quality. He adds coconut vinegar, a little cooked brown rice in banana liquor, why koji isn't IMO, and why brown rice beats white.
Found Use local material for vinegar; it needs at least 4 to 5% acidity