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Ringelmann scale. A evaluate of smoke coloration. Invented by Professor Maximilian Ringelmann in Paris in 1888, it is basically a card with squares of black, white and shades of gray that's held up as well as comparative grayness on the smoke judged. We only use quality, credible resources to https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/

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