What is Directional Freezing?
Directional Freezing is a simple method to make crystal clear ice by controlling the direction that water freezes. It was first explained here on Alcademics.com by Camper English (me) in December 2009 after months of experiments. The method has been written about in books, used in commercial products, and is employed in many small cocktail bars around the world.
The Directional Freezing method is: Allow water to freeze into ice from only one direction (one side of a container) and the ice will be clear until the very last part to freeze. The last part to freeze (if allowed to freeze at all) will be cloudy.