The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 760
... Vegetable tannage . Vegetable tannage is quite ancient . The Hebrews used oak bark ; the Egyptians , babul pods ( 400 BC ) , and the Arabs barks and roots . A wide variety of vegetable tans are used today . Synthetic tannins were ...
... Vegetable tannage . Vegetable tannage is quite ancient . The Hebrews used oak bark ; the Egyptians , babul pods ( 400 BC ) , and the Arabs barks and roots . A wide variety of vegetable tans are used today . Synthetic tannins were ...
Page 762
... vegetable tanning mate- rials . The first of them , patented in 1911 , was based on phenols and cresols . Later , naphthalene was used . Syn- thetic tans must have a large polymer molecule and must also be soluble in water ; they are ...
... vegetable tanning mate- rials . The first of them , patented in 1911 , was based on phenols and cresols . Later , naphthalene was used . Syn- thetic tans must have a large polymer molecule and must also be soluble in water ; they are ...
Page 845
... vegetables , and soybeans . Liaoning is , nevertheless , a food - deficit province . It must depend partly on food from Kirin and Heilungkiang to the north and partly on imported grain . The summer in Liaoning is not long . In few ...
... vegetables , and soybeans . Liaoning is , nevertheless , a food - deficit province . It must depend partly on food from Kirin and Heilungkiang to the north and partly on imported grain . The summer in Liaoning is not long . In few ...
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