When describing a black or white patch developing on a wall, ceiling or floor in our building, should we say that it’s “mould” that’s causing these concerns, or is it “mildew” that does it?

We can see it’s spreading, so how alive is this stuff? Is it affecting our health? If only we had a way of recognising it and monitoring it. Mould and mildew create an undesirable environment indoors. Their little spores are hazardous to the lungs and irritating to the eyes, nose,…