PH Indicators

pH Indicators

Indicator Name	Lower pH and Color	Upper pH and Color
Malachite green oxalate	0.0 green	2.0 green-blue
Brilliant green	0.0 yellow	2.6 green
Eosin yellowish	0.0 yellow	3.0 green fluoresc.
Erythrosine B	0.0 yellow	3.6 red
Methyl green	0.1 yellow	2.3 blue
Methyl violet	0.1 yellow	2.7 violet
Picric acid	0.2 colourless	1.0 yellow
Cresol red	0.2 red	1.8 yellow
Crystal violet	0.8 yellow	2.6 blue/violet
m-Cresol purple	1.2 red	2.8 yellow
Thymol blue	1.2 red	2.8 yellow
p-Xylenol blue	1.2 red	2.8 yellow
Eosin, bluish	1.4 colourless	2.4 pink fluoresc.
Quinaldine red	1.4 colourless	3.2 pink
2,4-Dinitro phenol	2.8 colourless	4.7 yellow
4-(Dimethylamino) azobenzol	2.9 red	4.0 yellow/orange
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Indicator Name	Lower pH and Color	Upper pH and Color
Bromochlorophenol blue	3.0 yellow	4.6 blue/violet
Bromophenol blue	3.0 yellow	4.6 blue/violet
Congo red	3.0 blue	5.2 yellow/orange
Methyl orange	3.1 red	4.4 yellow/orange
Bromocresol green	3.8 yellow	5.4 blue
2,5-Dinitrophenol	4.0 colourless	5.8 yellow
Alizarin sulphonic acid	4.3 yellow	6.3 violet
Methyl red	4.4 red	6.2 yellow/orange
Chlorophenol red	4.8 yellow	6.4 purple
Litmus	5.0 red	8.0 blue
Bromocresol purple	5.2 yellow	6.8 purple
Bromophenol red	5.2 orange/yellow	6.8 purple
4-Nitrophenol	5.4 colourless	7.5 yellow
Bromoxylenol blue	5.7 yellow	7.5 blue
Bromothymol blue	6.0 yellow	7.6 blue
Phenol red	6.4 yellow	8.2 red/violet
3-Nitrophenol	6.6 colourless	8.6 yellow/orange
Neutral red	6.8 blue/red	8.0 orange/yellow
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Indicator Name	Lower pH and Color	Upper pH and Color
Creosol red	7.0 orange	8.8 purple
1-Naphtholphthalein	7.1 brownish	8.3 blue/green
m-Cresol purple	7.4 yellow	9.0 purple
Thymol blue	8.0 yellow	9.6 blue
p-Xylenol blue	8.0 yellow	9.6 blue
Phenolphthalein	8.2 colourless	9.8 red/violet
Alizarin(1)	8.6 yellow	11.4 red
Thymolphthalein	9.3 colourless	10.5 blue
Alkali blue	9.4 violet	14.0 pink
Alizarin yellow GG	10.0 bright yellow	12.1 brown/yellow
Indigo carmine	11.5 blue	13.0 yellow
Epsilon blue	11.6 orange	13.0 violet
Sodium indigo sulfonate(1)	11.7 blue	13.9 yellow
Titan yellow	12.0 yellow	13.0 red
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