Information: 100% pure organic vanilla extract, infused with chamomile in a small convenient spray bottle. By applying to rats, focusing on the nose, and under the base of the tail, it helps mask the rats scent and prevent the rat from identifying an "intruders" scent. When Everyone smells the same, rats are more likely to accept new-comers. The chamomile can have a calming effect, which is what you want during an introduction.
Why We love it: This is a small amount, perfect for the introduction process. It's in a convenient spray bottle, so you can just spray under the base of the tail, instead of having to manually apply it there (ew!). It can also be used to spray a fine mist all over the rats. Be sure to apply with your hand onto the rats' noses, as you don't want to accidentally get any in your ratties' eyes.
This video is great for showing how to introduce rats, however it doesn't mention using vanilla, but when the rats first meet in their neutral territory, is when using the vanilla is most useful. Also would be useful when placing them in their cage together for the first time as well.