Do not panic. This is not mold. What you are actually seeing is the fibrous pulp from the vanilla pod swelling and expanding from the alcohol. Some customers describe this as cloudy, murky, or resembling blobs of coagulated fat. Vanilla beans contain pulp. This sometimes leaches into the alcohol. Just continue to shake and let age as normal. Once properly aged and ready for decanting, simply strain using cheesecloth, a coffee filter, or a small house household strainer. We promise you, once strained, the vanilla extract will have a beautiful amber color. Now you can use, gift or do whatever you like, just do not drink the stuff. You might end up with a headache the next morning. *Pro tip: If you are gifting your vanilla extract and like the look of have a vanilla bean in the bottle, be sure to save one or two beans to add to each bottle. Personally we like to preserve a couple vanilla beans in sugar while our vanilla extract ages. It dries out the vanilla beans ever so slightly and the small touch of sugar goes a long way in bringing out the natural vanilla flavor just like salt in a savory recipe.