Word: lignin
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Dates: during 1940-1949
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...synthetic rubber supplies may be stretched from two to five times by generous admixture of lignin, a gummy byproduct of the paper industry...
...plastics supplies can probably be doubled by adding lignin-and though plastics have been tiresomely fanfared as coming wartime substitutes for metals in civilian goods, engineers last week confessed that plastics are as scarce as metals, will go almost exclusively into armaments...