“Mold” and “Mildew” are terms that are used generally to describe the growths of fungi on various surfaces. “Mildew” also is a scientific term that describes a type of plant disease. In common usage, the difference between mold and mildew usually is in their appearance and the surfaces on which they are growing. Mold is often thicker and black, green, red, or blue in color, and mildew usually is lighter, powdery, and gray or white. Both mold and mildew often grow in moist and warm locations, but mildew is more often found in showers, on paper, and on fabrics, and mold is often found on foods and in walls and other permanent structures.
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