If you fear black-colored molds, that's good.  While not all of them are toxic, many are, especially  Stachbotrys chartarum . Needs moisture, organic material and oxygen to grow. All molds spread through spores that float, like in a ventilation system. The spores themselves are not dangerous, but the mycotoxins they carry are. The mycotoxins, toxic trichothecenes, are produced by molds.   Only a third of black molds form toxic compounds. People with a weakened immune system or of older age are especially vulnerable. For details, go to a World Health Organization publication-- WHO Guidelines for Indoor Air Quality:  Dampness and Mould  ( this is how they spell mold in Europe ). Microbial pollution can be caused by hundreds of bacteria and fungi, in particular filamentous fungi ( mold ). Mold is associated with building moisture and biological agents. Causes respiratory symptoms, exacerbates allergies and asthma and perturbs the immunological system. 10 warni...