Why absinthe turns cloudy when mixed with water has always been mystery in the cocktail world, another unique characteristic of this sometimes bright-green spirit to go with its colorful history.
A mystery until now, that is.
Turns out that absinthe and some other anise-based spirits go through the louche effect, an unusual chemical reaction that emulsifies the water and absinthe together to create the milky effect.
It's another fun fact that you can pull out of your back pocket when a bottle of the Green Fairy comes out.
→ Read more: Why Does Absinthe Get Cloudy? from Serious Eats