There are many different types of mold and most people try to determine mold type by its color. Examples of mold colors include green, white, grey, brown, and black. The fact is that mold color hardly ever conveys ultra-specific information, as there exists both hazardous and non-hazardous types of mold within each group of colors. It is challenging, if not entirely impossible to establish whether or not a mold is dangerous based solely on its surface appearance.