The differences in one table
| Item | Usucha | Koicha |
|---|---|---|
| Ratio | 1.5 to 2 g in 60 to 80 ml of water | 4 to 6 g in 30 to 40 ml of water |
| Consistency | Liquid, with dense foam | Thick paste, no foam |
| Water temperature | 65 to 75 °C | 80 to 85 °C |
| Whisking technique | Fast W or M, 15 to 20 s | Slow circles, 2 to 3 min |
| Matcha quality | First-harvest ceremonial | The best you can get |
| Taste | Balanced, foamy | Intense, complex, creamy |
| In the ceremony | End of the chaji, and chakai | The central phase of the chaji |
| Sharing the bowl | Individual | Several guests share it |
Why koicha needs a better matcha
At koicha concentrations (4 to 6 g in 30 to 40 ml), the L-theanine carrying umami and sweetness has to be enough to offset the greater extraction of bitter catechins. Only a first-harvest matcha from a premium cultivar (Gokou, Asahi, Samidori) has that much. With a second harvest or a middling quality, koicha comes out undrinkable: bitter and astringent at once.
Sharing the bowl in koicha
In the tea ceremony (chaji), koicha is served in a single large chawan that passes from guest to guest. Each takes a sip, wipes the rim with a fukusa, the silk cloth, and hands it on. The gesture has a specific meaning: everyone drinks from the same bowl, which creates an experience of equality and communion.