pH Indicator Paper

IndicatorLow pH colorTransition pH rangeHigh pH colorGentian violet (Methyl violet 10B)yellow0.0–2.0blue-violetLeucomalachite green (first transition)yellow0.0–2.0greenLeucomalachite green (second transition)green11.6–14colorlessThymol blue (first transition)red1.2–2.8yellowThymol blue (second transition)yellow8.0–9.6blueMethyl yellowred2.9–4.0yellowBromophenol blueyellow3.0–4.6purpleCongo redblue-violet3.0–5.0redMethyl orangered3.1–4.4orangeBromocresol greenyellow3.8–5.4blueMethyl redred4.4–6.2yellowMethyl redred4.5–5.2greenAzolitminred4.5–8.3blueBromocresol purpleyellow5.2–6.8purpleBromothymol blueyellow6.0–7.6bluePhenol redyellow6.8–8.4redNeutral redred6.8–8.0yellowNaphtholphthaleincolorless to reddish7.3–8.7greenish to blueCresol Redyellow7.2–8.8reddish-purplePhenolphthaleincolorless8.3–10.0fuchsiaThymolphthaleincolorless9.3–10.5blueAlizarine Yellow Ryellow10.2–12.0redLitmusred4.5-8.3blue