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
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.
