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Neurospora crassa (new-rah-spore-ah crah-sah) produces spores that appear pink. And the Penicillium (pen-ih-sill-ee-um) molds, the molds that make penicillin, are blue-green. Some of the colors on your bread may be the result of growing colonies of bacteria, which also sometimes grow on old food
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Foods that are moldy may also have invisible bacteria growing along with the mold. Yes, some molds cause allergic reactions and respiratory problems. And a few molds, in the right conditions, produce "mycotoxins," poisonous substances that can make you sick.