These slides from a Florida State University lab are made by crystallizing alcohol on a lab slide, then passing a polarized light through the crystal.
No information on brands used. See the rest of the Rainbow here. These are also sold as art prints by the lab, for people who want to see the microscopic Rainbow as they taste it.
The news that brought this tidbit from Time Magazine was that yet another study has shown that moderate drinkers have the most longevity, heavy drinkers come in second, and non-drinkers are the surprising caboose in third place. So why do you think drinkers outlive non-drinkers?