a shorter shelf-life than pasteurized sake. Since is not pasteurized, it is generally characterized by a strong, fresh, sweet, and fruity flavor that is easy for beginners to enjoy. Also, because fermentation continues in the bottle, the change in flavor can be enjoyed over time, and some are effervescent due to the production of gases during fermentation. () is undiluted sake. Most sake is diluted with water after brewing to lower the alcohol content from 18–20% down to 14–16%, but is not. () means unfiltered. It refers to sake that has not been carbon filtered but that has been pressed and separated from the lees and thus is clear, not cloudy. Carbon filtration can remove desirable flavors and odors as well as bad ones, thus sake has stronger flavors than filtered varieties. () is sake made by squeezing mash and putting the freshly made sake directly into a bottle without transferring it to a tank. It is generally effervescent and has a strong flavor because it is filled in the bottle with as little exposure to the air as possible to the freshest liquor that continues to ferment. It is a sake that maximizes the advantages of or . Nigorizake () is cloudy sake. The sake is passed through a loose mesh to separate it from the mash. In the production process of , rough cloth or colander is used to separate mash. It is not filtered after that, and there is much rice sediment in the bottle. It is generally characterized by its rich sweetness derived from rice. Nigorizake is sometimes unpasteurized namazake, which means that it is still fermenting and has a effervescent quality. Therefore, shaking the bottle or exposing it to high temperatures may cause the sake to spurt out of the bottle, so care should be taken when opening the bottle. When first opening the bottle, the cap should be slightly opened and then closed repeatedly to release the gas that has filled the bottle little by little. To maximize the flavor of nigorizake, there are some tips on how to drink it. First drink only the clear supernatant, then close the cap and slowly turn the bottle upside down to mix the sediment with the clear sake to enjoy the change in flavor. () is a sake with less turbidity than . is filtered differently from and is filtered in the same way as ordinary