PubMed · 2887762
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R Wang. 1987-08-22. Cigarette tar reduction.. https://doi.org/10.1016/s0140-6736(87)90997-4
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The number of official inspection of coal-tar dyes and their lakes from April in 1996 till March in 1997 were 581 in total. The quantity which passed inspection amounted to 164.5 ton in Japan. The production of color in each month was summarised in Table1, and by each producing company in Table2. The food coal-tar dye produced in the largest quantity was Food Yellow No. 4, occupying 43.4% in this period.
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