I made some IMBC and added the vanilla,brand new bottle.I added only 2 tbls instead of the 6tbls it called for.The flavor is so strong it's just gross.Just wondering if there was anything I can do and if I should throw the bottle away?Thanks Oh yeah,I used Sylvia W. buttercream recipe.
Found this after doing a Google search. It seems to not go bad as long as you seal it properly (tighten the lid). http://answers.yahoo.com/question/index?qid=20060812194611AAwEOoJ
My grandma also told me that you should always keep Vanilla away from light, so I keep it in a drawer instead of the spice rack. I think that vanilla last at least a year if not longer.
Some brands of vanilla are much stronger than others. If it's a brand you alway use, maybe you got a bad batch. Another possibility, vanilla extract is made with a lot of alcohol, I would imagine the it would evaporate pretty quickly if left open and could concentrate the flavor.
Thanks guys,all the info was great.I just threw the bottle away,I did not want to take another chance and waste all my icing again!