Japanese Onsen & Sauna Guide
Spring Quality & Science
Deep dive into onsen spring types, components, and scientific knowledge
AllBasic Knowledge and IntroductionThe Appeal of Japan's Hot Springs and SaunasHealth & BenefitsSpring Quality & ScienceThematic GuidesTips for a Successful Trip
25 articles in total
Spring Quality & Science
Green Hot Springs: Causes, Examples & Bathing Safety
Confused by green hot springs? Discover why water appears green, why photos can mislead, which mineral sources often show green hues, and essential safety tips for bathing.
Dec 24, 2025
Spring Quality & Science
Brown Hot Springs: Why They Color, Iron Links & Safety
Confused by brown hot springs? Learn why iron colors water, identify iron-rich springs, avoid towel staining and drinking risks, and follow safe bathing tips.
Dec 24, 2025
