Put the tofu in a cool place to ferment for three days, open the tinfoil to change the air once a day. After three days there will be mucus on top of the tofu, and if the temperature is high enough there will be yellow hairs which means the fermentation is successful.

Businesses in the production of stinky tofu, usually the first fermentation of stinky brine, and then the production of tofu embryo, and finally the embryo of tofu, soaked in fermented stinky brine.