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Genshu, shiboritate, muroka, tobingakoi and shizuku (pressing and finishing styles)原酒
These names describe how sake is pressed and finished, not how it is brewed. Genshu is sold without the water that normally brings sake down to about 15 % alcohol, so it stays at 17–20 %. Shiboritate is shipped straight after pressing, muroka skips charcoal filtering, and shizuku drips from hanging bags with no pressure.
Fully documentedAlcoholic drinks21 days – 28 daysGenshu is an optional label term defined in the National Tax Agency's sake labelling standard; shiboritate, muroka, tobingakoi and shizuku are trade terms that are not on that list of optional label termsFamily: Sake (base flow: junmai, sokujo starter)
Recipe
Amounts from a sourceStandard main-mash ratios from the National Research Institute of Brewing. These styles can be made from any grade of sake.
Steamed polished rice80
Standard mash ratio, counted as polished rice[nrib2011]
koji/qu/mold-starter (rice koji) plus a yeast starter (shubo)
Total time across the recorded steps: 21 days – 28 days
Start
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What changes:Koji enzymes make sugar while yeast turns it to alcohol in the same tank
Step 1 of 5
Ferment the main mash
Time
21–28 days
Reported
Temperature
8–18 °C
Reported
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Aspergillus oryzae
Saccharomyces cerevisiae
Output: ripe moromi.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
At a glance
These names describe how sake is pressed and finished, not how it is brewed. Genshu is sold without the water that normally brings sake down to about 15 % alcohol, so it stays at 17–20 %. Shiboritate is shipped straight after pressing, muroka skips charcoal filtering, and shizuku drips from hanging bags with no pressure. Made in 5 steps over 21 days – 28 days. The longest step, ferment the main mash, takes 21–28 days (Japan Sake and Shochu Makers Association and…) and runs at 8–18 °C (Japan Sake and Shochu Makers Association and…). Aspergillus oryzae and Saccharomyces cerevisiae sake yeast do most of the fermenting.
The base sake flow can end with charcoal filtering, then pasteurising, storing for six months to a year and diluting to about 15 %. These styles leave out one of those finishing steps, press the mash more gently, or pick one part of the run.
Genshu strength
17–20 % alcohol, against around 15 % for diluted sake
Genshu rule
No water added after pressing, except a small adjustment that moves the alcohol by less than 1 %
GenshuNo water added after pressing; 17–20 % alcohol.
ShiboritateShipped straight after pressing with no storage; greener and more acidic.
MurokaNo charcoal filtering, or no second filtering at all.
Shizuku (fukurodori)Mash hung in cloth bags so sake drips out without pressure.
TobingakoiThe best part of a batch, pressed into 18 L tobin bottles.
ArabashiriThe first, slightly cloudy run from the press.
Safety
Genshu is stronger than most sake, at 17–20 % alcohol. Any of these styles sold as nama (unpasteurised) should be kept at 5 °C or colder, like namazake. The NRIB guide gives that rule for the quality of namazake, not as a health limit.