I guess you ignored the temperature of the hair surface. The temperature of the hair surface is preferably between 30-40℃. Too high or too low temperature will directly affect the hair surface. At this temperature, fermentation can be completed within 2-3 hours.

If the last time you did it was in summer, 30 minutes was enough to start, but this time it was winter, and you didn't start it in 30 minutes, it would be a dead face.

Generally, dry yeast and baking powder are used together, and the dosage is relatively small. About 500g of noodles, 3-5g of dry yeast and 5-15g of baking powder.

A healthy diet should always be the first consideration of food. When the steamed bread in the outside shop is fermented, most of them will use leavening agent, which is really soft to eat. The shopkeeper is worried about his wallet. As for health, who cares except ourselves?