Onsen OniOnsen Oni

Niji no yu

虹の湯二色の浜店にじのゆふたいろのはまてん

Bathing Complex
Kansai·Osaka
072-439-2227nijinoyu.jp

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

虹の湯温泉 二色の浜店

Niji-no-yu Onsen Nishiki-no-hama

Operated by · 株式会社ALLURE

Sampled at wellhead
湯
Simple
Classification

Sodium-Calcium Bicarbonate spring

A lightly mineralized simple thermal spring. The wellhead measures 29.7 °C, putting it in the low-temperature class — the bath water is reheated before serving. Neutral pH (7.4) and a faint yellow tint give a gentle, unassuming character, while a meaningful 60.8 mg/kg of metasilicic acid leaves the skin slightly smoother than the modest mineralization would suggest.

pH
7.41
Neutral
Source temperature
29.7°C
Low temp.
Tonicity
0.25g/kg
Hypotonic
Flow rate
880L/min
High
Free CO₂
4.40mg/kg
Low
Free H₂S
0.10mg/kg
Low
Color
faintly yellow and clear
Taste
almost tasteless
Odor
odorless
Highlights
  • High silica

Analyzed May 29, 2024·株式会社総合水研究所·Cert no. SP240010

Loading map…

SM
Sergey M
1 year ago

323. Niji no yu, Osaka Super sento with natural hot spring water, 30 minutes from Kansai Airport for 800-900. Operating hours listed as 10:00-24:00. They stamp the 41 Kansai Super Sento stamp rally 24/25. Has a restaurant, massage, barber shop, and massage chairs. 1. Outdoor area. 1.1. Nice round rotenburo with boulders. Slightly cloudy white-brown water, temperature around 40. 1.2. Three barrel baths with the same water as the rotenburo. 1.3. Rectangular herbal bath (ginger that day) with TV, yellowish-clear water. 1.4. Resting zone. 1.5. Steam bath. 2. Indoor area. 2.1. Bath with yellowish-clear water, also herbal (apparently an event bath), temperature around 40. 2.2. Three reclining jet baths. 2.3. Four seated/standing jet baths. 2.4. Three electric baths. 2.5. Sauna. 2.6. Cold bath. Good place, I'd consider it in combination with visiting Kansai Airport.