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STEP 1. Identify a potential food source. As mentioned above, nearly anything that was once alive (and a few that were not) are potential food sources for mold. However, some molds are more common than others. One of the most common molds is penicillin, which often grows on bread. Bread is convenient for mold for the same reason that it is a great food for people. The organic matter in the grains that make up bread have already been partially broken down. Just as with humans, bread is easier for mold to digest than are the grains themselves. Dairy products, and cheese in particular, also grow molds effectively. It may be easiest to trace the development of mold on a mold-free cheese such as a soft mozzarella. On the other hand, some cheese contain live mold inside of them or on an outer skin. These cheeses could serve as both mold food and a source for mold.

STEP 2. Find an appropriate container. Molds release spores that can cause allergies, and a few can even cause infections. While most are harmless, you should protect yourself. Look for a potential container in which the mold can grow. The best containers should be clear so you can observe the mold without exposing yourself to it. They also must have airtight and watertight seals. Even if you do not add moisture, the decomposition process will likely get messy.One of the best container options is a clear, sealable plastic bag. You can observe the mold as it grows and keep it perfectly contained. You may want to use a high quality plastic bag, as a broken seal later can lead to an awful mess. For all of the reasons previously mentioned, you should find a disposable container. After you have created a container full of mold, you must not open it.

STEP 3. Locate the ideal environment. As noted earlier, molds do not need to be kept out of the light, but high exposure to sunlight can potentially dry them out. Also, while some can live in the cold, the majority grow best in warm environments. Find a warm, sheltered place to keep you mold as it grows.

STEP 4. Seal the mold’s food source into the container. Mold spores are everywhere, and you will not need to “plant” them on the food source. They are certainly already there.Make sure the environment in the container is moist enough. Your goal should be to seal the container and never open it again while growing the mold. If the food source dries out as you are still waiting for mold to grow, you may have to open the container up and add more water. At the same time, most molds do not grow in directly in water. Keep the food source moist without flooding it.

STEP 5. Check the progress of the mold growth daily. Check the container for mold regularly, and daily if possible. If there is no apparent mold and the food source looks dry, open the container and sprinkle a few drops of water onto it. If you open the container, it may be a good idea to wear disposable rubber gloves and a mask to cover you face and nose. Even if you cannot see the mold, some may be growing already. Most molds are not dangerous, but some can be. Do not take any risks.

STEP 6. Learn about the mold that you grew. Observe it closely and note the colors and forms of the mold patches. They can indicate the type that is growing on the food source. You can find out more about common* molds on the webpage of the US Department of Agriculture website

STEP 7. Dispose of the mold when you are done. Throw the entire container in the garbage. Do not open the container.