Abstract: A refrigerator is described, specially for beverage bottles, in particular beer bottles, a humidity production system for a refrigerator and a method for generating a COVERING OF ICE CRYSTALS on the bottle. The objective of the invention is to provide an equipment for producing a COVERING OF ICE CRYSTALS on a beverage bottle, in particular beer bottles, which produces a covering of ice crystals regardless of the weather conditions of the place and without causing the freezing of the beverage. This objective is achieved with a refrigerator comprising a humidity production system (4) to produce humidity in the internal compartment (3), the humidity production system (4) having a water feed.