1. Lime

    Lime is mildly antiseptic so it is still used in agricultural buildings prior to lambing, for example, to help ‘cleanse’ the internal environment. Lime has been used for nearly 3,000 years. It was used for the Pantheon in Rome, the Great Wall of China, the aquaduct in Niemes, France 18AD (still waterproof). A quarter of all houses in Wales are built and plastered with lime mortar.