Range Indicator Lower Color Upper Color
9.5−10.4 Thymolphthalein Colorless Blue
9.9−11.8 Alizarin yellow R Yellow Dark orange
10.6−13.4 Methyl blue Blue Pale violet
11.1−12.8 Acid fuchsin Red Colorless
- 4−13.0 Indigo carmine Blue Yellow
- 7−12.8 2,4,6-Trinitrotoluene Colorless Orange
12.0−14.0 Trinitrobenzene Colorless Orange
Part V: Appendixes
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