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出典:Wiktionary
thymol blue (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/06 08:26 UTC 版)
Thymol blue (thymolsulphonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions. It transitions from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6.
thymol blue