When added artificially to a cheese, mold describes a fungus or fungiform bacteria necessary for the development of the cheese. It manifests either internally or on the surface. Cheese can also develop mold spontaneously or naturally, usually on the rind of a cheese. This mold is usually beneficial or innocuous, but can be harmful as well. Typically, darker-colored molds are beneficial or harmless such as blue, gray, brown, or dark orange.