Rainbow Cocktail Layering Tool. Prevents ingredients of different densities from mixing, for perfect layered drinks. Rainbow lets you easily create layered cocktails with a slow, controlled pour of liquid into your glass Works with hot or cold drinks – perfect for a Black and Tan Includes layering tool and instruction booklet Ultra-slow pour. Ultra-cool drink. By preventing liquids with different densities from getting unintentionally mixed up, you can create cocktails that look as good as they taste. With layer upon layer of flavor and color, it’s easy to make drinks at home like the one’s you’ve only seen from professional bartenders. Get your Rainbow Cocktail Layering Tool from Brookstone today.