pH Range  

Indicator

0.2 (red) - 1.8 (yellow)   Cresol Red
1.2 (red) -2.8 (yellow)   Cresolphthalein (meta)
1.2 (red) - 2.8 (yellow)   Cresol Purple
1.2 (red) - 2.8 (yellow)   Thymol Blue
2.9 (purple) - 4.6 (green)   Methyl Orange - Xylene Cyanol
3.0 (yellow) - 4.6 (blue)   Bromphenol Blue
3.0 (blue) - 5.0 (red)   Congo Red
3.0 (red) - 6.3 (yellow)   Methyl Orange
4.0 (yellow) - 5.6 (blue)   Bromcresol Green
4.0 (colorless) - 6.6 (green)   Dichlorofluorescein
4.2 (pink) - 6.2 (yellow)   Methyl Red
4.6 (pink) - 5.2 (green/blue)   Bromcresol Green / Methyl Red
4.6 (yellow) - 5.6 (red)   Alizarin Red S
5.2 (yellow) - 6.6 (purple)   Bromcresol Purple
5.2 (yellow) - 6.8 (red)   Chlorophenol Red
6.0 (yellow) - 7.6 (blue)   Bromthymol Blue
6.8 (yellow) - 8.2 (red)   Phenol Red
7.3 (colorless/reddish) - 8.7 (blue/green)   a-Naphtholphthalein
7.2 (yellow) - 8.8 (red)   Cresol Red
7.4 (yellow) - 9.0 (purple)   Cresolphthalein (meta)
7.4 (yellow) - 9.0 (purple)   Cresol Purple
8.0 (colorless) - 10 (pink)   Phenolphthalein
8.2 (colorless) - 9.8 (violet/red)   Cresolphthalein (ortho)
8.8 (colorless) - 10.5 (blue)   Thymolthalein
11.4 (blue) - 13.0 (yellow)   Indigo Carmine
1.0 - cherry/red   Universal Indicator
2.0 - rose    
3.0 - reddish/orange    
4.0 - orange/red    
5.0 - orange    
6.0 - yellow    
7.0 - yellowish/green    
8.0 - green    
9.0 - bluish/green    
10.0 - blue