Ringelmann scale. A evaluate of smoke colour. Invented by Professor Maximilian Ringelmann in Paris in 1888, it is actually a card with squares of black, white and shades of grey that's held up and also the comparative grayness with the smoke judged. Snus is usually a steam-pasteurized moist powdered https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/