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Fresh tobacco leaves of the variety "Oriental" were dried, ground and sieved. All precautions were taken to avoid contamination of the material with metals. The next step was homogenization by mixing in a plastic drum. Preliminary homogeneity checking con

Fresh tobacco leaves of the variety "Virginia" grown in Bulgaria were hand-picked, dried, comminuted and sieved in conditions preventing contamination with metals. The material was then homogenized by mixing in a plastic drum. After preliminary homogeneit