Some well known products can be identified visually e.g. asbestos Super Six Roofing, but the only accurate way of knowing is to have the product tested. This is why products must be ‘presumed positive’ until tested under the Act.
Just because you have asbestos located on your property doesn’t mean you’re at a higher health risk. But it does mean you need to ensure the material is well maintained to minimize the release of fibers or cause cross-contamination issues.
Just because it’s black doesn’t mean you have Stachybotrys Chartarum. You will need a test done to confirm this. Results can take up to 5 weeks or more as the lab needs to grow a culture from the sample.