Mu-seichō (無清澄)
"Unfined" — the Japanese label term for wines bottled without fining agents like egg white, isinglass, or bentonite
What It Means
Mu-seichō (無清澄) literally means "without clarification" or "unfined." On a Japanese wine label, it indicates that the producer has skipped traditional fining steps where clarifying agents are added to the wine to remove suspended particles, soften tannins, or stabilize against haze formation.
Common fining agents that mu-seichō wines avoid:
- Egg white (albumin) — softens tannins, removes harsh phenolics from reds
- Isinglass (fish-bladder protein) — clarifies whites
- Gelatin (animal-derived) — fines reds and whites
- Bentonite (clay) — protein-stabilizes whites
- Casein (milk protein) — used in some white winemaking
The mu-seichō claim does not mean the wine is unfiltered — that would be mu-roka. A wine can be filtered but unfined (clear, but no fining agents used) or unfiltered but fined (cloudy/lees-rich, but with egg-white or other agents added during cellar work). Most natural-wine producers practice both — mu-roka and mu-seichō together.
Vegan Implications
Most fining agents are animal-derived (egg, fish, milk, gelatin). Mu-seichō wines that also avoid animal-derived fining are effectively vegan-compliant — though Japan does not have a formal vegan-wine certification system. Producers who want to communicate vegan compatibility typically do so through mu-seichō plus mu-tenka labels.
Producers Using It
- Coco Farm (Tochigi)
- Hitomi Winery (Shiga)
- Yellow Magic Winery (Yamagata)
- Domaine Mont (Hokkaido)
- Kurambon (Yamanashi)
- Most 10R Winery alumni
Related Terms
- 無濾過 (mu-roka) — unfiltered (different production step from mu-seichō)
- 無添加 (mu-tenka) — no additives (broader, often includes mu-seichō)
- にごりワイン (nigori-wine) — cloudy wine (visible result, may or may not be mu-seichō)
Why It Matters
Mu-seichō is the Japanese term for one of the specific natural-wine production choices. Where European natural-wine vocabulary is broader and fuzzier ("vin nature," "no filtering or fining"), the Japanese practice has developed precise distinct terms — mu-tenka, mu-roka, mu-seichō — that allow producers to communicate exactly which interventions they have skipped. The specificity is one of the more useful contributions of Japanese natural-wine vocabulary to global natural-wine practice.
Details
- Literal meaning: "Without clarification"
- Scope: No fining agents (egg, isinglass, gelatin, bentonite, casein)
- Vegan implication: Often (but not always) vegan-compliant
- Related terms: mu-roka, mu-tenka, nigori-wine