The fast adhesion of black dust inside the home is called fogging. This phenomenon often occurs shortly after renovation. It is still not clear why and how it comes about. This is also the reason why it is not clear which substances are in the dust. In most cases, the black dust is completely harmless, but it can also contain solvents, plasticisers or other substances which comes out of the new wallpaper or wall colours after rennovation. This tests gives you an overview of the most common substances.