The order of magnitude of the presence of fine solid solids in the combustion gases can be conventionally evaluated by a characteris ic called "blackening index". The purpose of this standard is to describe a method for determining this blackening index according to the Bacharach scale.
NBN T 95-102-1978 history
1978NBN T 95-102-1978 Bestimmung der Bacharach-Zahl in Verbrennungsgassen Determination of the smoke density of flue gases