白矾 can be purchased from Chinatown, damn, I suddenly forgot the English word for it. I got it from 168 and unfortunately, only English on the bag. Usually I use only a bit of 白矾 and yeast and baking soda and everyone claims it looks and tasts like the real thing. But my mom said it's not good to eat too much 白矾, don't know whether it's true or not.
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