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I saw the trick with the "cola" at the chimestry class, we can't know if he, after emptying the bottle, didn't added anything else on the bottom surface..
Sean Fields and Morgan Strebler created similar effects a few years ago, but like Craig said this guy appear to be using a new, original method. If it's on the market, which I doubt, it's pretty obscure. And likely expensive as hell.
Adding to this, it's likely that the method won't be easy to repeat so don't expect to be able to do it to peoples drinks at parties or around tables at a restaurant.