Indicator	pH Range	Acid	Base
2,4-Dinitrophenol	2.4-4.0	colorless	yellow
Alizarin Red S	4.6 - 6.0
Alizarin sodium sulfonate	3.7-5.2	yellow	violet
Alizarin yellow	10.0-12.0	yellow	lilac
a-Naphtholbenzein	9.0-11.0	yellow	blue
a-Naphtholphthalein	7.3-8.7	rose	green
a-Naphthyl red	3.7-5.0	red	yellow
Azolitmin	5.0-8.0	red	blue
Brilliant Green	0.0 - 2.6
Bromcresol green	4.0-5.6	yellow	blue
Bromcresol purple	5.2-6.8	yellow	purple
Bromphenol blue	3.0-4.6	yellow	blue-violet
Bromphenol blue	6.2-7.6	yellow	blue
Chlorophenol Red	4.8 - 6.4
Chlorphenol red	5.4-6.8	yellow	red
Congo Red	3.0 - 5.0
Cresol red	7.2-8.8	yellow	red
Diazo violet	10.1-12.0	yellow	violet
Eosin Y	0.0 - 3.0
m-Cresol Purple	1.2 - 2.8
m-Cresol Red	2.0 - 3.0
Methyl orange	3.1-4.4	red	orange
Methyl Purple	4.8 - 5.4
Methyl red	4.4-6.2	red	yellow
Methyl Violet	0.1 - 3.2
Methyl yellow	2.9-4.0	red	yellow
Neutral red	6.8-8.0	red	yellow
Nile blue	10.1-11.1	blue	red
Nitramine	11.0-13.0	colorless	orange-brown
Pentamethoxy red	1.2-2.3	red-violet	colorless
p-Ethoxychrysoidine	3.5-5.5	red	yellow
Phenol red	6.4-8.0	yellow	red
Phenolphthalein	8.0 - 10
Phenolphthalein	8.0-10.0	colorless	red
p-Nitrophenol	5.0-7.0	colorless	yellow
Poirrier's blue	11.0-13.0	blue	violet-pink
Rosolic acid	6.8-8.0	yellow	red
Salicyl yellow	10.0-12.0	yellow	orange-brown
Sulfo Orange	11.0 - 12.6
Tetrabromphenol blue	3.0-4.6	yellow	blue
Thymol Blue	1.2-2.8	red	yellow
Thymol blue	8.0-9.6	yellow	blue
Thymolphthalein	9.4-10.6	colorless	blue
Trinitrobenzoic acid	12.0-13.4	colorless	orange-red
Tropeolin O	11.0-13.0	yellow	orange-brown
Tropeolin OO	1.3-3.2	red	yellow
Tropeolin OOO	7.6-8.9	yellow	rose-red