中延温泉
Nakanobu Onsen- Color
- colorless and clear
- Taste
- tasteless
- Odor
- almost odorless
Calcium-Sodium-Magnesium Bicarbonate-Chloride-Sulfate spring
pH 7.2NeutralHigh silica
Composition fingerprint0.4 g/kg dissolved · Hypotonic
Ca²⁺49
Na⁺22
Mg²⁺22
HCO₃⁻52
Cl⁻24
SO₄²⁻21
◀ CationsAnions ▶
- Calcium Ca²⁺
- settling and calming; can leave a white mineral bloom.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A well drilled beneath Togoshi in Shinagawa, Tokyo. The certificate assigns no therapeutic spring-quality name: the water qualifies as an onsen under Article 2 of the Hot Spring Law specifically on its metasilicic acid content. It is lightly mineralized at 352 mg/kg, neutral at pH 7.3, colorless, clear and all but odorless, with bicarbonate and calcium leading the ion table. Metasilicic acid at 76.9 mg/kg puts it in Japan's beauty-water family, enough silica to leave skin feeling noticeably smoother.
Sampled at wellhead·Analyzed Sep 24, 2004·財団法人 中央温泉研究所·Cert no. 甲第3101号