In recent years, layering has become more and more popular - like the Black Cherry Cooler. To layer a drink, pour the ingredients in a shot glass, from the heaviest to the lightest. To prevent them from mixing together, carefully pour over a barspoon (or teaspoon). Because they differ in density, the layers will stay separate. To properly layer a cocktail, you’ll need to know what your ingredients weigh in relation to one another. One good rule of thumb is that the lower the proof of the alcohol, the heavier it is (Jim Beam Black® with 86 proof (43% vol.) is heavier than Jim Beam® Bonded with 100 proof (50% vol.) and grenadine is among the heaviest ingredients).