Ferment tofu in the shade for three days, and open the tin foil once a day to change the air. After three days, there will be mucus on the tofu. If the temperature is high enough, there will be yellow hair, which means that the fermentation is successful.

When making stinky tofu, merchants usually ferment the stinky brine first, then make tofu embryos, and finally soak the tofu embryos in the fermented stinky brine.