When you are looking to purchase a home, you want to make sure there are no signs of mould. Mould is a major red flag because it could mean there are serious problems with the foundation and drainage systems of the house. Signs of mould include discolouration (mould can be any colour – black, red, or green) and a musty odour. If you suspect discolouration is mould, you can easily test it by dropping some bleach on the affected area. If the discolouration disappears, it is likely mould. Since problems with mould can be persistent, you should be cautious of purchasing a home with mould problems.