Health & Safety Black Mold: What It Is, Why It Grows, and What to Do About It Black mold usually means Stachybotrys chartarum, a greenish-black mold that grows on materials that stay wet. Here is what it is, why it grows, and what to do. Health & Safety Is Black Mold Dangerous? What Health Agencies Actually Say Black mold can cause the same allergy and breathing problems as other molds, and some people are at higher risk. Here is what the CDC and EPA actually say. Health & Safety Mold Exposure Testing: What Medical and Home Tests Can and Cannot Tell You Testing for mold exposure can mean testing your body or your home. Here is what doctors use, why urine mycotoxin tests are not recommended, and where to start. Health & Safety What Does Black Mold Look Like? How to Recognize It, and What It Might Be Instead Black mold is usually greenish-black and often looks slimy or sooty, but many molds are dark and some dark stains are not mold at all. Here is how to tell.