Universal Indicator Solution, pH 2-10

pH 1.2-2.8 (red-yellow), pH 2.9-4.0 (red-yellow), pH 4.4-6.2 (red-yellow) pH 6.0-7.6 (yellow-blue), pH 8.0-9.6 (yellow-blue) thymol blue, 8.2-10 (pink-magenta) phenolpht, pH 10.2-12.0 (yellow-red).

 
pH 4.0 Red, 5.0 Orange Red, 5.5 Orange, pH 6.0 Yellow Orange, 6.5 Yellow Green, pH 7.0 Dark Greenish Yellow, 7.5 Dark Green, pH 8.0 Light Green, 8.5 Bluish Green.