Change it Up:
If using Grade A Vanilla Beans, use 1 and 1/2 beans for a 4 ounce bottle.
For an 8-ounce bottle of extract, simply double the amount of beans and vodka. You do not need to cut the beans in half, since they should fit the full length.
Get the most out of your beans! You can use your vanilla beans more than once! When you finish your bottle, simply pour in more vodka to top off, maybe add one more fresh bean, and wait another 8-12 weeks. Voila! Alternatively, take the beans (now much more soft and moist, even the Grade B), and use them (seeds and all) in a cooking or baking adventure!