NB Original & NB Original Mih NB Original is where it all started. A clear-coat single application, non-toxic, eco-friendly, multi-purpose fire retardant. It can be applied by airless spray to all kinds of wood including wood fibres and chips, it's easy to use and is invisible once dried.   NB Original has been tested extensively to British (Class 1), European (Class C), and US (Class A) standards.   NB Original Mih offers all the attributes of NB Original, but with added protection against Stachybotrys Chartarum - otherwise known as Toxic Black Mould.   Wherever NB Original Mih is applied Toxic Black Mould will not exist.