How to Taste Sake: What the Blue Circles Are For
To taste sake, look at it, smell it, take a small sip, breathe out through your nose, and then wait for the finish. Professional tasting follows the same sequence, and the blue-ringed cup that goes with it is a measuring tool rather than a ceremony: the blue is for judging clarity and the white porcelain around it is for judging color (Society for Nada Sake Research). Here is what each step is for, and what the cup is quietly doing.
What are the blue circles on a sake tasting cup for?
The two cobalt-blue rings on the base of a tasting cup (きき猪口, kiki-choko) are a built-in test card: the blue is used to judge a sake’s clarity and the white porcelain around it to judge its color, according to the glossary of the Society for Nada Sake Research (SNSR). The pattern is called 蛇の目 (janome), “snake’s eye”, and it is the main reason a sake tasting cup looks so different from a wine glass.
A standard cup is white porcelain and holds about 200 ml when full. The glossary stresses that tasting cups must be uniform in color, shape, size and weight, because the sensory evaluation of sake quality is a delicate process, and that an amber glass is used instead when an assessment needs to be free of any color influence. Seen this way, the janome cup is closer to a laboratory beaker than to a ceremonial vessel. Its job is to make every sample appear under identical conditions, so that any difference belongs to the sake and not to the cup. If you want the longer story of how a cup’s material and shape change what reaches your nose, see our guide to what cup to drink sake from.
What should you look for before you smell the sake?
Look at two things first, clarity and color, because the two parts of the janome cup are built to test exactly those (SNSR). Tilt the cup so the blue rings show through the sake: a clear sake keeps the rings sharp, and a hazy one blurs them. The white porcelain at the edge shows the color, from nearly colorless to pale gold.
Treat what you see as a clue, not a verdict. Some haze is intended, as in nigori, and some color is intended, as in aged sake (古酒, koshu), which we cover in our guide to aged sake. The eyes tell you what to expect from the next step, not whether the sake is good.
How do you smell sake properly?
Smell sake in two stages: first the top notes rising from the surface of the cup, then the aroma you catch by breathing out through your nose after a sip, which the SNSR glossary calls the flavor-in-the-mouth (引込み香, hikikomi-ka) (SNSR). The trade’s everyday words for the same two stages are 上立ち香 and 含み香 (fukumi-ka); the National Research Institute of Brewing (NRIB) treats both as customary terms outside its own standard vocabulary (NRIB Report No. 178). The names vary, but the idea is simple: the nose gets two separate chances at the same drink.
In a fragrant ginjo-style sake, much of what you smell is made by yeast. NRIB names ethyl caproate, which reads as apple and can be detected from 120 µg/L, and isoamyl acetate, which reads as banana and can be detected from 270 µg/L, in its aroma guide first issued in July 2011 and revised in August 2026 (NRIB). Those are millionths of a gram per liter, which is why a glass can smell so vivid while holding so little of the compounds. Our piece on what yeast does in sake explains where those esters come from.
The second stage matters because breathing out after a sip is one of the ways flavor reaches the nose at all. Sniffing the glass and sipping the sake are two different tests, and a sake can seem quiet in the first and expressive in the second.
How much sake should you sip, and for how long?
Take roughly 4–10 ml, about one to two teaspoons, and keep it in your mouth for two to three seconds, which is the amount and timing the SNSR glossary gives for professional tasting (SNSR). Breathe out through your nose, then let the sake spread across your tongue, front to back and side to side, and note its sweetness, dryness and overall balance.
Professionals then spit into a spittoon and judge the aftertaste, which is how a judge can assess dozens of samples in a session. At a dinner table you will swallow, and the principle is the same: the last step is to wait. The savoury depth that sake gets from amino acids tends to show up in that pause, a theme we explore in our piece on umami in sake.
How is tasting sake different from tasting wine?
Where wine tasting is often taught as see, swirl, sniff, sip and spit, the sake procedure documented by the SNSR has five stages of its own: color and clarity, top notes, flavor in the mouth, taste, and aftertaste, with no swirl among them (SNSR). Both traditions are built to do the same thing, which is to slow you down and give you a vocabulary for what you notice.
The differences are about conditions, not seriousness. The SNSR describes the more common method as tasting at about 20°C, called reishu kiki (冷酒きき), alongside a separate warmed method at about 50°C, called kanshu kiki (燗酒きき). The same bottle can therefore be judged twice, cool and warm, and neither result is treated as the real one. I could not find a study of swirling sake, so a gentle swirl is a habit borrowed from wine rather than a tested step. It will not hurt, and you do not need it.
The janome cup reads clarity, not ceremony. The blue rings exist so that a panel can compare many samples under identical conditions; they are not a ritual to perform at the table. If you take one idea from Japanese tasting, take the discipline rather than the props: the same vessel, the same small pour and the same temperature every time, so that what you notice belongs to the sake. A plain clear glass held over a white napkin does the same job.
What does a flawed sake smell like?
Ethyl acetate smells like nail-polish remover or adhesive when it is excessive, and NRIB lists its content in sake as 20–120 mg/L against a detection threshold of 24 mg/L, so the smell is a matter of degree rather than presence (NRIB). A trace of it is part of ordinary sake; a sharp solvent note that dominates the glass is the sign to stop.
Light is the other reliable culprit. NRIB’s training reference prepares its “sunlight odor” (日光臭) sample by leaving sake in a clear bottle in direct sunlight for three days, which is a useful reminder of how little it takes. Keeping a bottle out of the light is the simplest fix, and we cover it in how to store sake at home.
How do you taste sake at home in four steps?
Four steps cover it: look, smell, sip and breathe out, then wait for the finish, using a white or clear cup, a sake at about 20°C and a 4–10 ml sip (SNSR). Pour a second sake the same way and the differences between the two become much easier to name.
- Look. Tilt the cup over something white and judge clarity through the blue rings and color against the porcelain.
- Smell. Bring the cup to your nose before you drink and note the top notes, whether fruity, grainy, nutty or soft.
- Sip and breathe out. Take 4–10 ml, hold it for two to three seconds, breathe out through your nose and let it cover your tongue.
- Wait. Swallow, then pay attention to how long the flavor lasts and what is left behind.
Frequently asked questions
Why does a sake tasting cup have blue circles?
The two blue rings are a gauge for judging a sake’s clarity, and the white porcelain around them is used to judge its color, according to the Society for Nada Sake Research. The pattern is called 蛇の目 (janome), “snake’s eye”.
Do you swirl sake before tasting it?
Not in the standard procedure described by the SNSR, which moves from looking, to top notes, to a 4–10 ml sip held for two to three seconds (SNSR). You can swirl if you like, but I found no study showing what it does for sake, so treat it as optional.
Should you spit or swallow when tasting sake?
Professionals spit: the SNSR procedure ends by spitting into a spittoon after a 4–10 ml sip and then judging the aftertaste (SNSR). At home you can swallow, as long as you still pause to notice the finish.
What temperature should sake be for tasting?
About 20°C is the more common tasting temperature, called reishu kiki, while warmed tasting is usually about 50°C and called kanshu kiki (SNSR). Start at the cooler temperature and warm a second sample if you want to compare.
Sources
- Society for Nada Sake Research (SNSR). Kiki-choko・kiki-choku (きき猪口), Sake Glossary: cup material and size, the janome pattern, amber glass. nada-ken.com
- Society for Nada Sake Research (SNSR). Kiki-zake・kiki-shu (きき酒), Sake Glossary: tasting procedure, sample volume, holding time, tasting temperatures. nada-ken.com
- National Research Institute of Brewing (酒類総合研究所). Seishu no nioi to sono yurai ni tsuite (清酒のにおいとその由来について), first edition July 2011, revised August 2026: ethyl caproate, isoamyl acetate and ethyl acetate thresholds, off-odor reference samples. nrib.go.jp
- 宇都宮 仁, 磯谷 敦子, 岩田 博, 中野 成美. 清酒の官能評価分析における香味に関する品質評価用語及び標準見本 (Flavour terminology and reference standards for sensory analysis of sake). 酒類総合研究所報告 第178号, National Research Institute of Brewing. nrib.go.jp
Written by Dr. Sake. We take sake apart — the chemistry, the history, the label — and put it back together in plain English. For weekly diagrams, label breakdowns and brewery notes, follow @thesakeanatomy on Instagram.
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