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Like most extracts, vanilla comes in various folds (or strengths). That for domestic use is one fold; for industrial use you go to 2, 3, 4 folds etc. To make one gallon of pure extract you need over 13 oz (375g) of vanilla beans; to make 2 fold you need twice as much etc. So it"s an expensive commodity. When buying make sure the bottle says "essence" on the side and not "flavour" - which is very inferior, and actually made from wood pulp! See Vanillin; see 'Artificial flavours'