Mold is usually fuzzy in appearance. It can be many different colors, including blue, green, yellow, brown, gray, black, or white.

Mildew usually grows in a flat pattern and may appear either powdery or downy. Powdery mildew usually starts out white and may later turn yellow, brown, or black. Downy mildew usually starts out yellow and later turns brown.

Beneficial Uses Some forms of mold are used in the production of food, like cheese, and some forms of mold are used to make medications, like the antibiotic penicillin.