There are three main conditions for mold growth: oxygen, humidity and temperature. Bread itself has a certain humidity. If you want to cultivate mold with bread, you can put the bread in a plastic container. Then, you can return a small amount of water to the bread properly, and then make a few small holes in the plastic container. In this way, mold will grow in about three days. But after the mold grows, people must wear gloves to touch the moldy bread, so as not to accidentally infect their hands with mold.